Merge pull request #354 from Iterable/Release-3.3.1

Preparing for 3.3.1

Author: Ayyanchira

CHANGELOG.md

@@ -43,9 +43,9 @@ This project adheres to [Semantic Versioning](http://semver.org/).
       ...
   }
   ```
-
-#### Changed
+  
 - Updated minimum version for `firebase-messaging` to 20.3.0 to use `FirebaseMessaging.getToken()` instead of deprecated `FirebaseInstanceId.getToken()`.
+- Notifications will now show timestamp.
 
 ## [3.3.0](https://github.com/Iterable/iterable-android-sdk/releases/tag/3.3.0)
 #### Added