Prebid 6.0 (#7606)

* Update .babelrc.js

babel/babel#7789

* Update browsers.json

* Update README.md

* Update .babelrc.js

* Update package.json

* Update package.json

* Update package.json

* Update package.json

* Update .babelrc.js

* Update package.json

* Update wdio.conf.js

.babelrc.js

@@ -16,12 +16,9 @@ module.exports = {
       {
         "targets": {
           "browsers": [
-            "chrome >= 75",
-            "safari >=10",
-            "edge >= 70",
-            "ff >= 70",
-            "ie >= 11",
-            "ios >= 11"
+            ">0.25%",
+            "not ie 11",
+            "not op_mini all"
           ]
         }
       }

README.md

@@ -59,6 +59,8 @@ module.exports = {
           loader: 'babel-loader',
           // presets and plugins for Prebid.js must be manually specified separate from your other babel rule.
           // this can be accomplished by requiring prebid's .babelrc.js file (requires Babel 7 and Node v8.9.0+)
+          // as of Prebid 6, babelrc.js only targets modern browsers. One can change the targets and build for
+          // older browsers if they prefer, but integration tests on ie11 were removed in Prebid.js 6.0
           options: require('prebid.js/.babelrc.js')
         }
       }
@@ -314,7 +316,7 @@ For instructions on writing tests for Prebid.js, see [Testing Prebid.js](http://
 
 ### Supported Browsers
 
-Prebid.js is supported on IE11 and modern browsers.
+Prebid.js is supported on IE11 and modern browsers until 5.x. 6.x+ transpiles to target >0.25%; not Opera Mini; not IE11. 
 
 ### Governance
 Review our governance model [here](https://github.com/prebid/Prebid.js/tree/master/governance.md).

browsers.json

@@ -15,14 +15,6 @@
     "device": null,
     "os": "Windows"
   },
-  "bs_ie_11_windows_10": {
-    "base": "BrowserStack",
-    "os_version": "10",
-    "browser": "ie",
-    "browser_version": "11.0",
-    "device": null,
-    "os": "Windows"
-  },
   "bs_chrome_90_windows_10": {
     "base": "BrowserStack",
     "os_version": "10",

wdio.conf.js

@@ -9,7 +9,7 @@ function getCapabilities() {
     return platformMap[os];
   }
 
-  // only IE 11, Chrome 80 & Firefox 73 run as part of functional tests
+  // only Chrome 80 & Firefox 73 run as part of functional tests
   // rest of the browsers are discarded.
   delete browsers['bs_chrome_79_windows_10'];
   delete browsers['bs_firefox_72_windows_10'];