Documenting new behavior in CHANGES.md

Author: mumrah

CHANGES.md

@@ -1,3 +1,7 @@
 # Notable Changes
 
 * Changing auto_commit to False in [SimpleConsumer](kafka/consumer.py), until 0.8.1 is release offset commits are unsupported
+
+* Adding fetch_size_bytes to SimpleConsumer constructor to allow for user-configurable fetch sizes
+
+* Allow SimpleConsumer to automatically increase the fetch size if a partial message is read and no other messages were read during that fetch request. The increase factor is 1.5