chore: update CHANGELOG for version 2.1.0 with updates and fixes

Author: lposen

CHANGELOG.md

@@ -1,5 +1,5 @@
 ##2.1.0
-### Features
+### Updates
 * SDK is now compatible with both New Architecture and Legacy Architecture. Fix
   for #691, #602, #563.
 
@@ -8,7 +8,7 @@
 
 ## 2.1.0-beta.1
 
-## Fixes
+### Fixes
 - Add Temporary fix for circular paths, which break expo ([9c09743](https://github.com/Iterable/react-native-sdk/commit/9c09743))
 
 ## 2.1.0-beta.0
@@ -22,7 +22,7 @@
 
 ## 2.0.4
 
-## Updates
+### Updates
 - Added API documentation via Netlify([1087275](https://github.com/Iterable/react-native-sdk/commit/1087275))
 - Removed dependency on `react-native-vector-icons`, per issues
   [#513](https://github.com/Iterable/react-native-sdk/issues/513),