update changelog.

Author: Ethan Cohen

CHANGELOG.md

@@ -1,3 +1,12 @@
+2.1.0 / 2018-04-19
+==================
+- Fix undefined bug for template strings. #45
+- Adding support for `objectRestSpread` within props #60
+- Accommodate ExperimentalSpreadProperty in prop values #75
+- Account for SpreadElement AST Nodes #76
+- Support OptionalMemberExpression AST nodes #77
+- Add support to Typescript's node types #72 
+
 2.0.1 / 2017-08-31
 ==================
 - [fix] Add support for BindExpression