Additional datastore change log since 0.10.0 (#377)

* Additional changes to datastore change log since 0.10.0

Author: wooj2

CHANGELOG.md

@@ -15,7 +15,11 @@ A declarative library for application development using cloud services.
   - Add support for REST API with Cognito User Pools [#312](https://github.com/aws-amplify/amplify-ios/pull/312)
   - Migrate APIPlugin's websocket provider to use AppSyncRealTimeClient [#330](https://github.com/aws-amplify/amplify-ios/pull/330), [#341](https://github.com/aws-amplify/amplify-ios/pull/341), [#352](https://github.com/aws-amplify/amplify-ios/pull/352)
 - **DataStore**
-  - DataStore.save() API now takes in a condition [#355](https://github.com/aws-amplify/amplify-ios/pull/355)
+  - DataStore.save() now supports passing in condition [#355](https://github.com/aws-amplify/amplify-ios/pull/355)
+  - Added reachability and retryability to remote sync engine [#321](https://github.com/aws-amplify/amplify-ios/pull/321) [#322](https://github.com/aws-amplify/amplify-ios/pull/322) [#323](https://github.com/aws-amplify/amplify-ios/pull/323) [#324](https://github.com/aws-amplify/amplify-ios/pull/324)
+  - Fix out of bounds case when retry handler >= 57 [#338](https://github.com/aws-amplify/amplify-ios/pull/338)
+  - Datastore.delete(modelType) with predicate [#346](https://github.com/aws-amplify/amplify-ios/pull/346)
+  - Datastore.clear() async to remove local datastore [#353](https://github.com/aws-amplify/amplify-ios/pull/353)
 
 ## 0.10.0