Add resolution for engine.io.

package.json

@@ -62,5 +62,8 @@
   "bugs": {
     "url": "https://github.com/ember-cli/ember-resolver/issues"
   },
-  "homepage": "https://github.com/ember-cli/ember-resolver#readme"
+  "homepage": "https://github.com/ember-cli/ember-resolver#readme",
+  "resolutions": {
+    "**/engine.io": "3.3.1"
+  }
 }

yarn.lock

@@ -3168,16 +3168,17 @@ engine.io-parser@~2.1.0, engine.io-parser@~2.1.1:
     blob "0.0.4"
     has-binary2 "~1.0.2"
 
-engine.io@~3.2.0:
-  version "3.2.0"
-  resolved "https://registry.yarnpkg.com/engine.io/-/engine.io-3.2.0.tgz#54332506f42f2edc71690d2f2a42349359f3bf7d"
+engine.io@3.3.1, engine.io@~3.2.0:
+  version "3.3.1"
+  resolved "https://registry.yarnpkg.com/engine.io/-/engine.io-3.3.1.tgz#e076d9d2d6c075dda4623253b80fa045c81dd3a4"
+  integrity sha512-p0njqQo5QWVxJauKcnp5IO+LBeE5JD1tAf+UxPU8ASEUHSpsSSfYR+kVb8XGGH8AEDUa1Dk5jCvPQShNBL5BdQ==
   dependencies:
     accepts "~1.3.4"
     base64id "1.0.0"
     cookie "0.3.1"
     debug "~3.1.0"
     engine.io-parser "~2.1.0"
-    ws "~3.3.1"
+    ws "~6.1.0"
 
 ensure-posix-path@^1.0.0, ensure-posix-path@^1.0.1, ensure-posix-path@^1.0.2, ensure-posix-path@^1.1.0:
   version "1.1.1"
@@ -7243,6 +7244,13 @@ ws@~3.3.1:
     safe-buffer "~5.1.0"
     ultron "~1.1.0"
 
+ws@~6.1.0:
+  version "6.1.4"
+  resolved "https://registry.yarnpkg.com/ws/-/ws-6.1.4.tgz#5b5c8800afab925e94ccb29d153c8d02c1776ef9"
+  integrity sha512-eqZfL+NE/YQc1/ZynhojeV8q+H050oR8AZ2uIev7RU10svA9ZnJUddHcOUZTJLinZ9yEfdA2kSATS2qZK5fhJA==
+  dependencies:
+    async-limiter "~1.0.0"
+
 xdg-basedir@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/xdg-basedir/-/xdg-basedir-3.0.0.tgz#496b2cc109eca8dbacfe2dc72b603c17c5870ad4"