(chore):update changelog for 3.0.1 patch release. This release will be used … (#284)

* update changelog for 3.0.1 patch release.  This release will be used by 3.0.1 android patch release.

* added link to PR

Author: thomaszurkan-optimizely

CHANGELOG.md

@@ -1,5 +1,15 @@
 # Optimizely Java X SDK Changelog
 
+## 3.0.1
+
+April 23, 2019
+
+This is a simple fix so that older versions of org.json can still parse the datafile.  
+
+### Bug Fix
+We use org.json.JSONArray. Older versions do not support the iterator.  In order to ensure that the datafile is still parsable if you use a older version, we changed to use the get method instead of the iterator.
+([#283](https://github.com/optimizely/java-sdk/pull/283))
+
 ## 3.0.0
 
 February 13, 2019