Update README.md

Added link to release notes

Author: MIchaelMainer

README.md

@@ -88,6 +88,7 @@ The following sample applications are also available:
 * [Collections](docs/collections.md)
 * [Errors](docs/errors.md)
 * [Microsoft Graph API](https://graph.microsoft.io)
+* [Release notes](https://github.com/microsoftgraph/msgraph-sdk-dotnet/releases/tag/1.1.0)
 
 ## Issues