Update changelog.md 0.10.0 (#275)

* Update changelog.md 0.10.0

* Update CHANGELOG.md

Author: lawmicha

CHANGELOG.md

@@ -2,6 +2,24 @@
 
 A declarative library for application development using cloud services.
 
+## 0.10.0
+
+### New Features
+
+- Adding amplify specific user agent, revival of PR#166 ([#271](https://github.com/aws-amplify/amplify-ios/issues/271))
+
+### Updates
+
+- **API**
+  - Reprovision API Integration test backends ([#250](https://github.com/aws-amplify/amplify-ios/issues/250))
+  - Remove dependency on ModelRegistry for adding syncable fields to selection set. ([#252](https://github.com/aws-amplify/amplify-ios/issues/252))
+- **DataStore**
+  - Adding unit tests for AWSMutationDatabaseAdapterTests ([#231](https://github.com/aws-amplify/amplify-ios/issues/231))
+  - Initial sync startup/3-way merge ([#238](https://github.com/aws-amplify/amplify-ios/issues/238))
+  - Integrate retryability for outgoing mutation queue ([#266](https://github.com/aws-amplify/amplify-ios/issues/266))
+- **Storage**
+  - Reprovision Storage Integration test backend ([#256](https://github.com/aws-amplify/amplify-ios/issues/256))
+
 ## 0.9.0
 
 Initial release! Includes Core features, plus support for these categories: