Merge pull request #196 from thomasvl/readme_tweak

Add note about using the REST version instead

Author: thomasvl

README.md

@@ -12,7 +12,17 @@ This is the recommended library for accessing JSON-based Google APIs for iOS and
 Mac OS X applications.  The library is compatible with applications built for
 iOS 3 and later, and Mac OS X 10.5 and later.
 
-**To get started** with Google  APIs and the Objective-C client library,  read
+---
+
+> **NOTE:** This library has been replaced by
+> [Google APIs Client Library for Objective-C For REST](https://github.com/google/google-api-objectivec-client-for-rest).
+> New applications should use that instead; existing application should be
+> updated as soon as possible as the Google servers will eventually stop
+> accepting JSON-RPC requests.
+
+---
+
+**To get started** with Google APIs and the Objective-C client library, read
 the [wiki](https://github.com/google/google-api-objectivec-client/wiki)
 and study the
 [example applications](https://github.com/google/google-api-objectivec-client/tree/master/Examples).