2.10.0 (#1258)

* 2.10.0

* downgrading mocha. v4 doesn't play nice with wds

README.md

@@ -84,18 +84,15 @@ you edit your assets while the server is running.
 
 See [**the documentation**][docs-url] for more use cases and options.
 
-## Caveats
-
-Version 2.8.0 introduced a change which included ES6 keywords `const` and `let`
-within the scripts being served to the browser. This effects environments which
-support _no ES6 whatsoever_, including older versions of UglifyJS and Internet
-Explorer. This was not considered a breaking change at the time due to official
-support for oldIE ending in 2016, rather this was seen as a maintenance update.
-Those wishing to support oldIE should stick with version 2.7.1.
-
-For version 2.8.0+ those using UglifyJS in their webpack configs should use the
-beta version of [uglifyjs-webpack-plugin][uglify-url] independently, and _not_
-the built-in plugin. This will change once the new version is out of beta.
+## Browser Support
+
+While `webpack-dev-server` transpiles the client (browser) scripts to an ES5
+state, the project only officially supports the _last two versions of major
+browsers_. We simply don't have the resources to support every whacky
+browser out there.
+
+If you find an bug with an obscure / old browser, we would actively welcome a
+Pull Request to resolve the bug.
 
 ## Support