diff --git a/modules.json b/modules.json
index 9c4ebcfe4b8..64a354276a1 100644
--- a/modules.json
+++ b/modules.json
@@ -40,5 +40,6 @@
     "tripleliftBidAdapter",
     "trustxBidAdapter",
     "undertoneBidAdapter",
-    "unrulyBidAdapter"
+    "unrulyBidAdapter",
+    "yieldoneBidAdapter"
 ]
diff --git a/package-lock.json b/package-lock.json
index 235b688cc12..b7ff88f7186 100755
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "prebid.js",
-  "version": "3.4.0",
+  "version": "3.6.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -3462,6 +3462,7 @@
         "timespan": "2.3.0",
         "uglify-js": "1.3.5",
         "walker": "1.0.7",
+        "winston": "3.2.1",
         "wrench": "1.3.9"
       },
       "dependencies": {
@@ -3881,6 +3882,15 @@
         "object-visit": "1.0.1"
       }
     },
+    "color": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/color/-/color-3.0.0.tgz",
+      "integrity": "sha512-jCpd5+s0s0t7p3pHQKpnJ0TpQKKdleP71LWcA0aqiljpiuAkOSUFN/dyH8ZwF0hRmFlrIuRhufds1QyEP9EB+w==",
+      "requires": {
+        "color-convert": "1.9.3",
+        "color-string": "1.5.3"
+      }
+    },
     "color-convert": {
       "version": "1.9.3",
       "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.3.tgz",
@@ -3894,16 +3904,38 @@
       "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.3.tgz",
       "integrity": "sha1-p9BVi9icQveV3UIyj3QIMcpTvCU="
     },
+    "color-string": {
+      "version": "1.5.3",
+      "resolved": "https://registry.npmjs.org/color-string/-/color-string-1.5.3.tgz",
+      "integrity": "sha512-dC2C5qeWoYkxki5UAXapdjqO672AM4vZuPGRQfO8b5HKuKGBbKWpITyDYN7TOFKvRW7kOgAn3746clDBMDJyQw==",
+      "requires": {
+        "color-name": "1.1.3",
+        "simple-swizzle": "0.2.2"
+      }
+    },
     "color-support": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/color-support/-/color-support-1.1.3.tgz",
       "integrity": "sha512-qiBjkpbMLO/HL68y+lh4q0/O1MZFj2RX6X/KmMa3+gJD3z+WwI1ZzDHysvqHGS3mP6mznPckpXmw1nI9cJjyRg=="
     },
+    "colornames": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/colornames/-/colornames-1.1.1.tgz",
+      "integrity": "sha1-+IiQMGhcfE/54qVZ9Qd+t2qBb5Y="
+    },
     "colors": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/colors/-/colors-1.4.0.tgz",
-      "integrity": "sha512-a+UqTh4kgZg/SlGvfbzDHpgRu7AAQOmmqRHJnxhRZICKFUT91brVhNNt58CMWU9PsBbv3PDCZUHbVxuDiH2mtA==",
-      "dev": true
+      "integrity": "sha512-a+UqTh4kgZg/SlGvfbzDHpgRu7AAQOmmqRHJnxhRZICKFUT91brVhNNt58CMWU9PsBbv3PDCZUHbVxuDiH2mtA=="
+    },
+    "colorspace": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/colorspace/-/colorspace-1.1.2.tgz",
+      "integrity": "sha512-vt+OoIP2d76xLhjwbBaucYlNSpPsrJWPlBTtwCpQKIu6/CSMutyzX93O/Do0qzpH3YoHEes8YEFXyZ797rEhzQ==",
+      "requires": {
+        "color": "3.0.0",
+        "text-hex": "1.0.0"
+      }
     },
     "combine-lists": {
       "version": "1.0.1",
@@ -4706,6 +4738,16 @@
       "integrity": "sha1-gGZJMmzqp8qjMG112YXqJ0i6kTw=",
       "dev": true
     },
+    "diagnostics": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/diagnostics/-/diagnostics-1.1.1.tgz",
+      "integrity": "sha512-8wn1PmdunLJ9Tqbx+Fx/ZEuHfJf4NKSN2ZBj7SJC/OWRWha843+WsTjqMe1B5E3p28jqBlp+mJ2fPVxPyNgYKQ==",
+      "requires": {
+        "colorspace": "1.1.2",
+        "enabled": "1.0.2",
+        "kuler": "1.0.1"
+      }
+    },
     "diff": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/diff/-/diff-1.4.0.tgz",
@@ -5221,6 +5263,14 @@
       "integrity": "sha1-TapNnbAPmBmIDHn6RXrlsJof04k=",
       "dev": true
     },
+    "enabled": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/enabled/-/enabled-1.0.2.tgz",
+      "integrity": "sha1-ll9lE9LC0cX0ZStkouM5ZGf8L5M=",
+      "requires": {
+        "env-variable": "0.0.6"
+      }
+    },
     "encodeurl": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/encodeurl/-/encodeurl-1.0.2.tgz",
@@ -5354,6 +5404,11 @@
       "integrity": "sha1-6WQhkyWiHQX0RGai9obtbOX13R0=",
       "dev": true
     },
+    "env-variable": {
+      "version": "0.0.6",
+      "resolved": "https://registry.npmjs.org/env-variable/-/env-variable-0.0.6.tgz",
+      "integrity": "sha512-bHz59NlBbtS0NhftmR8+ExBEekE7br0e01jw+kk0NDro7TtZzBYZ5ScGPs3OmwnpyfHTHOtr1Y6uedCdrIldtg=="
+    },
     "errno": {
       "version": "0.1.7",
       "resolved": "https://registry.npmjs.org/errno/-/errno-0.1.7.tgz",
@@ -5684,7 +5739,7 @@
           "integrity": "sha1-RdG35QbHF93UgndaK3eSCjwMV6c=",
           "dev": true,
           "requires": {
-            "locate-path": "^2.0.0"
+            "locate-path": "2.0.0"
           }
         },
         "locate-path": {
@@ -5693,8 +5748,8 @@
           "integrity": "sha1-K1aLJl7slExtnA3pw9u7ygNUzY4=",
           "dev": true,
           "requires": {
-            "p-locate": "^2.0.0",
-            "path-exists": "^3.0.0"
+            "p-locate": "2.0.0",
+            "path-exists": "3.0.0"
           }
         },
         "p-limit": {
@@ -5703,7 +5758,7 @@
           "integrity": "sha512-vvcXsLAJ9Dr5rQOPk7toZQZJApBl2K4J6dANSsEuh6QI41JYcsS/qhTGa9ErIUUgK3WNQoJYvylxvjqmiqEA9Q==",
           "dev": true,
           "requires": {
-            "p-try": "^1.0.0"
+            "p-try": "1.0.0"
           }
         },
         "p-locate": {
@@ -5712,7 +5767,7 @@
           "integrity": "sha1-IKAQOyIqcMj9OcwuWAaA893l7EM=",
           "dev": true,
           "requires": {
-            "p-limit": "^1.1.0"
+            "p-limit": "1.3.0"
           }
         },
         "p-try": {
@@ -5727,7 +5782,7 @@
           "integrity": "sha1-9tXREJ4Z1j7fQo4L1X4Sd3YVM0s=",
           "dev": true,
           "requires": {
-            "find-up": "^2.1.0"
+            "find-up": "2.1.0"
           }
         }
       }
@@ -5758,7 +5813,7 @@
           "integrity": "sha1-RdG35QbHF93UgndaK3eSCjwMV6c=",
           "dev": true,
           "requires": {
-            "locate-path": "^2.0.0"
+            "locate-path": "2.0.0"
           }
         },
         "load-json-file": {
@@ -5767,10 +5822,10 @@
           "integrity": "sha1-eUfkIUmvgNaWy/eXvKq8/h/inKg=",
           "dev": true,
           "requires": {
-            "graceful-fs": "^4.1.2",
-            "parse-json": "^2.2.0",
-            "pify": "^2.0.0",
-            "strip-bom": "^3.0.0"
+            "graceful-fs": "4.2.3",
+            "parse-json": "2.2.0",
+            "pify": "2.3.0",
+            "strip-bom": "3.0.0"
           }
         },
         "locate-path": {
@@ -5779,8 +5834,8 @@
           "integrity": "sha1-K1aLJl7slExtnA3pw9u7ygNUzY4=",
           "dev": true,
           "requires": {
-            "p-locate": "^2.0.0",
-            "path-exists": "^3.0.0"
+            "p-locate": "2.0.0",
+            "path-exists": "3.0.0"
           }
         },
         "p-limit": {
@@ -5789,7 +5844,7 @@
           "integrity": "sha512-vvcXsLAJ9Dr5rQOPk7toZQZJApBl2K4J6dANSsEuh6QI41JYcsS/qhTGa9ErIUUgK3WNQoJYvylxvjqmiqEA9Q==",
           "dev": true,
           "requires": {
-            "p-try": "^1.0.0"
+            "p-try": "1.0.0"
           }
         },
         "p-locate": {
@@ -5798,7 +5853,7 @@
           "integrity": "sha1-IKAQOyIqcMj9OcwuWAaA893l7EM=",
           "dev": true,
           "requires": {
-            "p-limit": "^1.1.0"
+            "p-limit": "1.3.0"
           }
         },
         "p-try": {
@@ -5813,7 +5868,7 @@
           "integrity": "sha1-9ID0BDTvgHQfhGkJn43qGPVaTck=",
           "dev": true,
           "requires": {
-            "error-ex": "^1.2.0"
+            "error-ex": "1.3.2"
           }
         },
         "path-type": {
@@ -5822,7 +5877,7 @@
           "integrity": "sha1-8BLMuEFbcJb8LaoQVMPXI4lZTHM=",
           "dev": true,
           "requires": {
-            "pify": "^2.0.0"
+            "pify": "2.3.0"
           }
         },
         "pify": {
@@ -5837,9 +5892,9 @@
           "integrity": "sha1-jvHAYjxqbbDcZxPEv6xGMysjaPg=",
           "dev": true,
           "requires": {
-            "load-json-file": "^2.0.0",
-            "normalize-package-data": "^2.3.2",
-            "path-type": "^2.0.0"
+            "load-json-file": "2.0.0",
+            "normalize-package-data": "2.5.0",
+            "path-type": "2.0.0"
           }
         },
         "read-pkg-up": {
@@ -5848,8 +5903,8 @@
           "integrity": "sha1-a3KoBImE4MQeeVEP1en6mbO1Sb4=",
           "dev": true,
           "requires": {
-            "find-up": "^2.0.0",
-            "read-pkg": "^2.0.0"
+            "find-up": "2.1.0",
+            "read-pkg": "2.0.0"
           }
         }
       }
@@ -6339,6 +6394,11 @@
       "resolved": "https://registry.npmjs.org/fast-levenshtein/-/fast-levenshtein-2.0.6.tgz",
       "integrity": "sha1-PYpcZog6FqMMqGQ+hR8Zuqd5eRc="
     },
+    "fast-safe-stringify": {
+      "version": "2.0.7",
+      "resolved": "https://registry.npmjs.org/fast-safe-stringify/-/fast-safe-stringify-2.0.7.tgz",
+      "integrity": "sha512-Utm6CdzT+6xsDk2m8S6uL8VHxNwI6Jub+e9NYTcAms28T84pTa25GJQV9j0CY0N1rM8hK4x6grpF2BQf+2qwVA=="
+    },
     "faye-websocket": {
       "version": "0.10.0",
       "resolved": "https://registry.npmjs.org/faye-websocket/-/faye-websocket-0.10.0.tgz",
@@ -6356,6 +6416,11 @@
         "bser": "2.1.1"
       }
     },
+    "fecha": {
+      "version": "2.3.3",
+      "resolved": "https://registry.npmjs.org/fecha/-/fecha-2.3.3.tgz",
+      "integrity": "sha512-lUGBnIamTAwk4znq5BcqsDaxSmZ9nDVJaij6NvRt/Tg4R69gERA+otPKbS86ROw9nxVMw2/mp1fnaiWqbs6Sdg=="
+    },
     "fibers": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/fibers/-/fibers-3.1.1.tgz",
@@ -8756,7 +8821,7 @@
           "integrity": "sha512-mel+jf7nrtEl5Pn1Qx46zARXKDpBbvzezse7p7LqINmdoIk8PYP5SySaxEmYv6TZ0JyEKA1hsCId6DIhgITtWQ==",
           "dev": true,
           "requires": {
-            "ms": "^2.1.1"
+            "ms": "2.1.2"
           }
         },
         "ms": {
@@ -10583,6 +10648,14 @@
       "resolved": "https://registry.npmjs.org/kleur/-/kleur-3.0.3.tgz",
       "integrity": "sha512-eTIzlVOSUR+JxdDFepEYcBMtZ9Qqdef+rnzWdRZuMbOywu5tO2w2N7rqjoANZ5k9vywhL6Br1VRjUIgTQx4E8w=="
     },
+    "kuler": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/kuler/-/kuler-1.0.1.tgz",
+      "integrity": "sha512-J9nVUucG1p/skKul6DU3PUZrhs0LPulNaeUOox0IyXDi8S4CztTHs1gQphhuZmzXG7VOQSf6NJfKuzteQLv9gQ==",
+      "requires": {
+        "colornames": "1.1.1"
+      }
+    },
     "last-run": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/last-run/-/last-run-1.1.1.tgz",
@@ -11006,6 +11079,25 @@
         }
       }
     },
+    "logform": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/logform/-/logform-2.1.2.tgz",
+      "integrity": "sha512-+lZh4OpERDBLqjiwDLpAWNQu6KMjnlXH2ByZwCuSqVPJletw0kTWJf5CgSNAUKn1KUkv3m2cUz/LK8zyEy7wzQ==",
+      "requires": {
+        "colors": "1.4.0",
+        "fast-safe-stringify": "2.0.7",
+        "fecha": "2.3.3",
+        "ms": "2.1.2",
+        "triple-beam": "1.3.0"
+      },
+      "dependencies": {
+        "ms": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w=="
+        }
+      }
+    },
     "loglevelnext": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/loglevelnext/-/loglevelnext-1.0.5.tgz",
@@ -12231,6 +12323,11 @@
         "wrappy": "1.0.2"
       }
     },
+    "one-time": {
+      "version": "0.0.4",
+      "resolved": "https://registry.npmjs.org/one-time/-/one-time-0.0.4.tgz",
+      "integrity": "sha1-+M33eISCb+Tf+T46nMN7HkSAdC4="
+    },
     "onetime": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/onetime/-/onetime-2.0.1.tgz",
@@ -13908,6 +14005,21 @@
       "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.2.tgz",
       "integrity": "sha1-tf3AjxKH6hF4Yo5BXiUTK3NkbG0="
     },
+    "simple-swizzle": {
+      "version": "0.2.2",
+      "resolved": "https://registry.npmjs.org/simple-swizzle/-/simple-swizzle-0.2.2.tgz",
+      "integrity": "sha1-pNprY1/8zMoz9w0Xy5JZLeleVXo=",
+      "requires": {
+        "is-arrayish": "0.3.2"
+      },
+      "dependencies": {
+        "is-arrayish": {
+          "version": "0.3.2",
+          "resolved": "https://registry.npmjs.org/is-arrayish/-/is-arrayish-0.3.2.tgz",
+          "integrity": "sha512-eVRqCvVlZbuw3GrM63ovNSNAeA1K16kaR/LRY/92w0zxQ5/1YzwblUX652i4Xs9RwAGjW9d9y6X88t8OaAJfWQ=="
+        }
+      }
+    },
     "sinon": {
       "version": "4.5.0",
       "resolved": "https://registry.npmjs.org/sinon/-/sinon-4.5.0.tgz",
@@ -14747,6 +14859,11 @@
         }
       }
     },
+    "text-hex": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/text-hex/-/text-hex-1.0.0.tgz",
+      "integrity": "sha512-uuVGNWzgJ4yhRaNSiubPY7OjISw4sw4E5Uv0wbjp+OzcbmVU/rsT8ujgcXJhn9ypzsgr5vlzpPqP+MBBKcGvbg=="
+    },
     "text-table": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",
@@ -15005,6 +15122,11 @@
       "integrity": "sha512-MUjYItdrqqj2zpcHFTkMa9WAv4JHTI6gnRQGPFLrt5L9a6tRMiDnIqYl8JBvu2d2Tc3lWJKQwlGCp0K8AvCM+Q==",
       "dev": true
     },
+    "triple-beam": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/triple-beam/-/triple-beam-1.3.0.tgz",
+      "integrity": "sha512-XrHUvV5HpdLmIj4uVMxHggLbFSZYIn7HEWsqePZcI50pco+MPqJ50wMGY794X7AOOhxOBAjbkqfAbEe/QMp2Lw=="
+    },
     "trough": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/trough/-/trough-1.0.4.tgz",
@@ -16261,7 +16383,7 @@
           "integrity": "sha512-GIyAXC2cB7LjvpgMt9EKS2ldqr0MTrORaleiOno6TweZ6r3TKtoFQWay/2PceJ3RuBasOHzXNn5Lrw1X0bEjqA==",
           "dev": true,
           "requires": {
-            "async-limiter": "~1.0.0"
+            "async-limiter": "1.0.1"
           }
         }
       }
@@ -16958,6 +17080,51 @@
       "integrity": "sha1-VDjNLqk7IC76Ohn+iIeu58lPnJ0=",
       "dev": true
     },
+    "winston": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/winston/-/winston-3.2.1.tgz",
+      "integrity": "sha512-zU6vgnS9dAWCEKg/QYigd6cgMVVNwyTzKs81XZtTFuRwJOcDdBg7AU0mXVyNbs7O5RH2zdv+BdNZUlx7mXPuOw==",
+      "requires": {
+        "async": "2.6.3",
+        "diagnostics": "1.1.1",
+        "is-stream": "1.1.0",
+        "logform": "2.1.2",
+        "one-time": "0.0.4",
+        "readable-stream": "3.6.0",
+        "stack-trace": "0.0.10",
+        "triple-beam": "1.3.0",
+        "winston-transport": "4.3.0"
+      },
+      "dependencies": {
+        "async": {
+          "version": "2.6.3",
+          "resolved": "https://registry.npmjs.org/async/-/async-2.6.3.tgz",
+          "integrity": "sha512-zflvls11DCy+dQWzTW2dzuilv8Z5X/pjfmZOWba6TNIVDm+2UDaJmXSOXlasHKfNBs8oo3M0aT50fDEWfKZjXg==",
+          "requires": {
+            "lodash": "4.17.15"
+          }
+        },
+        "readable-stream": {
+          "version": "3.6.0",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.0.tgz",
+          "integrity": "sha512-BViHy7LKeTz4oNnkcLJ+lVSL6vpiFeX6/d3oSH8zCW7UxP2onchk+vTGB143xuFjHS3deTgkKoXXymXqymiIdA==",
+          "requires": {
+            "inherits": "2.0.3",
+            "string_decoder": "1.1.1",
+            "util-deprecate": "1.0.2"
+          }
+        }
+      }
+    },
+    "winston-transport": {
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/winston-transport/-/winston-transport-4.3.0.tgz",
+      "integrity": "sha512-B2wPuwUi3vhzn/51Uukcao4dIduEiPOcOt9HJ3QeaXgkJ5Z7UwpBzxS4ZGNHtrxrUvTwemsQiSys0ihOf8Mp1A==",
+      "requires": {
+        "readable-stream": "2.3.6",
+        "triple-beam": "1.3.0"
+      }
+    },
     "word-wrap": {
       "version": "1.2.3",
       "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.3.tgz",