adjust changelog

Author: benbrown

changelog.md

@@ -6,8 +6,12 @@
 
 # 0.7.0
 
-* Remove all functionality pertaining to Botkit Studio statistics and analytics APIs
-* Remove `stats_optout` flag from configuration
+This release is the first major step towards [deprecating Botkit Studio](https://github.com/howdyai/botkit/issues/1534),
+and introducing a more general system for scripted dialogs and content from [Botkit CMS](https://github.com/howdyai/botkit-cms).
+
+* Remove all functionality pertaining to Botkit Studio statistics and analytics APIs. All stats related services provided by Botkit Studio will cease operation on Dec 15.
+* Remove `stats_optout` flag from configuration.
+* Support for Facebook Personas API. [Full docs here](https://botkit.ai/docs/readme-facebook.html#personas-api) -- [Thanks to @oaudie-lahdioui](https://github.com/howdyai/botkit/pull/1497)!
 
 # 0.6.21