updating change log

Author: jsstylos

CHANGELOG.md

@@ -1,9 +1,23 @@
 Change Log
 ==========
 
+## Version 0.15.0
+
+_2016-07-07_
+
+* New: index_document in Document Conversion
+* New: using requests.session for connection pooling
+* Fixed: bug with model_id in translation
+
+## Version 0.14.0
+
+_2016-06-12_
+
+* New: Conversation v1 experimental service
+
 ## Version 0.13.0
 
 _2016-06-07_
 
- * New: Visual Recognition V3
+ * New: Visual Recognition v3 service
  * New: Alchemy Language typed_relations