Update CHANGES.rst

CHANGES.rst

@@ -12,7 +12,8 @@ overal growth of the Matrix ecosystem. It is defined as:-
          * Where account creation and last_seen are > 30 days"
 
 
-Features
+Features:
+
 * Add joinability for groups (PR #3045)
 * Implement group join API (PR #3046)
 * Add counter metrics for calculating state delta (PR #3033)
@@ -22,7 +23,8 @@ Features
 * Add response size metrics (PR #3071)
 * phone home cache size configurations (PR #3063)
 
-Changes
+Changes:
+
 * Add a blurb explaining the main synapse worker (PR #2886) Thanks to @turt2live!
 * Replace old style error catching with 'as' keyword (PR #3000) Thanks to @NotAFile!
 * Use .iter* to avoid copies in StateHandler (PR #3006)
@@ -33,7 +35,8 @@ Changes
 * Remove uses of events.content (PR #3060)
 * Improve database cache performance (PR #3068)
 
-Bug fixes
+Bug fixes:
+
 * Add room_id to the response of `rooms/{roomId}/join` (PR #2986) Thanks to @jplatte!
 * Fix replication after switch to simplejson (PR #3015)
 * Fix replication after switch to simplejson (PR #3015)