Update CHANGES.md for release.

Author: jmctwilio

CHANGES.md

@@ -3,9 +3,15 @@ twilio-csharp Changelog
 
 [2017-08-11] Version 5.6.1
 ---------------------------
+Updated requirements for NewtonSoft and DotNet
+
+**TwiML**
+- Add missing Gather attributes
+
 **Api**
 - Add New wireless usage keys added
 - Add `auto_correct_address` param for Addresses create and update
+- Add ChatGrant grant and deprecate IpMessagingGrant
 
 **Preview**
 - Removed 'email' from bulk_exports configuration api [bi]. No migration plan needed because api has not been used yet.
@@ -14,7 +20,6 @@ twilio-csharp Changelog
 **Video**
 - Add `video_codec` enum and `video_codecs` parameter, which can be set to either `VP8` or `H264` during room creation.
 - Restrict recordings page size to 100
-- Add query parameters `SourceSid`, `Status`, `DateCreatedAfter` and `DateCreatedBefore` to the convenience method for retrieving Room recordings.
 
 
 [2017-07-27] Version 5.6.0