adds BC breaking changes note to CHANGELOG

Author: videlalvaro

CHANGELOG.md

@@ -4,11 +4,14 @@ All Notable changes to `PhpAmqpLib` will be documented in this file
 
 ## 2.6.0 - 2015-09-23
 
+### BC Breaking Changes
+- The `AMQPStreamConnection` class now throws `ErrorExceptions` when errors happen while reading/writing to the network.
+
 ### Added
 - Heartbeat frames will decrease the timeout used when calling wait_channel - heartbeat frames do not reset the timeout
 
 ### Fixed
 - Declared the class AbstractChannel as being an abstract class
 - Reads, writes and signals respond immediately instead of waiting for a timeout
-- Fatal error in some cases on Channel.wait with timeout when rabbitMQ restarted
+- Fatal error in some cases on Channel.wait with timeout when RabbitMQ restarted
 - Remove warning when trying to push a deferred frame