Add changelog for 2.0 release

Author: SpaceK33z

CHANGELOG.md

@@ -0,0 +1,10 @@
+# 2.0 (unreleased)
+
+- Only compatible with webpack v2.
+- Add compatibility for web workers (#298).
+- `--inline` is enabled by default now.
+- Convert to `yargs` to handle commandline options.
+- Allow a `Promise` instead of a config object in the CLI (#419).
+- Add `--hot-only` flag, a shortcut that adds `webpack/hot/only-dev-server` in `entry` in the webpack config (#439).
+
+For the 1.x changelog, see the [webpack-1 branch](https://github.com/webpack/webpack-dev-server/blob/webpack-1/CHANGELOG.md).