Update change log for v2.0.1 release

Author: peternewnham

CHANGELOG.md

@@ -1,5 +1,13 @@
 # Change Log
 
+## v2.0.1
+### Updates
+- Added `preprocessNodes` option to ReactHTMLParser function. This function is passed the raw
+node tree before `react-html-parser` processes it which it should return after any modifications
+are made to it
+- Exposed `htmlparser2` library
+- Updated the demo site to React v16
+
 ## v2.0.0
 ### Breaking Changes
 - ReactHtmlParser now decodes html entities by default