updated changelog

Author: gregorleban

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Change Log
 
+## [v8.5]() (2018-08-29)
+
+**Added**
+- Added `Analytics.trainTopicOnTweets()` method that can be used to train a topic by analyzing a group of tweets. See example of usage on the [wiki page](https://github.com/EventRegistry/event-registry-python/wiki/Text-analytics#train-a-topic-based-on-the-tweets).
+- Added a group of `Analytics.trainTopic*()` methods that can be used to analyze your own documents and build a topic from them. See example of usage on the [wiki page](https://github.com/EventRegistry/event-registry-python/wiki/Text-analytics#train-a-custom-topic).
+
 ## [v8.4]() (2018-08-24)
 
 **Added**