Update CHANGELOG.md

Author: Seldaek

CHANGELOG.md

@@ -1,6 +1,10 @@
-## 3.1.0 (xxxx-xx-xx)
+## 3.1.0 (2017-03-26)
 
 * Added support for server_log handler
+* Allow configuring VERBOSITY_QUIET in console handlers
+* Fixed autowiring
+* Fixed slackbot handler not escaping channel names properly
+* Fixed slackbot handler requiring `slack_team` instead of `team` to be configured
 
 ## 3.0.3 (2017-01-10)