add docs link

Author: Ilya Brin

README.md

@@ -1,6 +1,6 @@
 [![CocoaPods](https://img.shields.io/cocoapods/v/IterableSDK.svg?style=flat)](https://cocoapods.org/pods/IterableSDK)
 [![License](https://img.shields.io/cocoapods/l/IterableSDK.svg?style=flat)](https://opensource.org/licenses/MIT)
-[![Docs](https://img.shields.io/cocoapods/metrics/doc-percent/IterableSDK.svg?style=flat)](http://cocoadocs.org/docsets/IterableSDK/1.0.0/)
+[![Docs](https://img.shields.io/cocoapods/metrics/doc-percent/IterableSDK.svg?style=flat)](http://cocoadocs.org/docsets/IterableSDK/2.0.0/)
 
 # Iterable iOS SDK