Revert "Update README.md"

This reverts commit 92c4eda.

Author: muthurathinam-m

README.md

@@ -325,6 +325,28 @@ We'd love to get your feedback about the Microsoft Graph JavaScript client libra
 
 ## Contributing
 Please see the [contributing guidelines](CONTRIBUTING.md).
+## Changelog
+
+#### 1.0.0
+* Added tests for new Graph functionality - Delta query, Extensibility, OneNote, and more.
+
+#### 0.4.0
+* Add support for ES5. Make sure to use `graph-js-sdk-web.js` for web apps
+* Removed iterator helper method.
+
+#### 0.3.1
+* Support for Node.js versions 4 and 5
+
+#### 0.3.0
+* Migrated away from typings in client library core and TypeScript sample
+
+#### 0.2.2
+* Updated SuperAgent to version ``` 3.3.0 ```
+
+#### 0.2.0
+* **Breaking change for existing apps** - Initialize the client library with `MicrosoftGraph.Client.init({...})`. See the updated usage section below for code samples.
+* Added response handling tests to simulate Graph calls
+* Added type declarations file for core client library, which adds intellisense for chained methods.
 
 
 ## Additional resources