update changelog

Author: Suchita Doshi

CHANGELOG.md

@@ -3,6 +3,11 @@
 #### :bug: Bug Fix
 * [#3](https://github.com/ember-codemods/ember-tracked-properties-codemod/pull/3) update package repo url ([@suchitadoshi1987](https://github.com/suchitadoshi1987))
 
+## v0.2.1 (2019-12-24)
+
+#### :rocket: Enhancement
+* [#2](https://github.com/ember-codemods/ember-tracked-properties-codemod/pull/2) Fix the inline prefix issue and added an option for default prefixing ([@suchitadoshi1987](https://github.com/suchitadoshi1987))
+
 #### Committers: 1
 - Suchita Doshi ([@suchitadoshi1987](https://github.com/suchitadoshi1987))