Update changelog for 2.0.5

Author: Tyler Brandt

packages/optimizely-sdk/CHANGELOG.MD

@@ -4,6 +4,12 @@ June 25, 2018
 * Fix: Failure to log success message when event dispatched ([#123](https://github.com/optimizely/javascript-sdk/pull/123))
 * Fix: Don't call success message when event fails to send ([#123](https://github.com/optimizely/javascript-sdk/pull/123))
 
+## 2.0.5
+June 25, 2018
+
+* Fix: Failure to log success message when event dispatched ([#123](https://github.com/optimizely/javascript-sdk/pull/123))
+* Fix: Don't call success message when event fails to send ([#123](https://github.com/optimizely/javascript-sdk/pull/123))
+
 ## 2.1.1
 June 19, 2018