docs: updated changelog for v2

Author: Gareth Jones

CHANGELOG.md

@@ -1,5 +1,16 @@
 # Streamroller Changelog
 
+## 2.0.0
+
+- [Remove support for node v6](https://github.com/log4js-node/streamroller/pull/44)
+- [Replace lodash with native alternatives](https://github.com/log4js-node/streamroller/pull/45) - thanks [@devoto13](https://github.com/devoto13)
+- [Simplify filename formatting and parsing](https://github.com/log4js-node/streamroller/pull/46)
+- [Removed async lib from main code](https://github.com/log4js-node/streamroller/pull/47)
+- [Fix timezone issues in tests](https://github.com/log4js-node/streamroller/pull/48) - thanks [@devoto13](https://github.com/devoto13)
+- [Fix for flag values that need existing file size](https://github.com/log4js-node/streamroller/pull/49)
+- [Refactor for better readability](https://github.com/log4js-node/streamroller/pull/50)
+- [Removed async lib from test code](https://github.com/log4js-node/streamroller/pull/51)
+
 ## 1.0.6
 
 - [Fix for overwriting old backup files](https://github.com/log4js-node/streamroller/pull/43)