Update README to reflect Grease is now on github

Johan Brichau · Johan Brichau · commit 4bc2f3c9a313 · 2017-06-04T09:59:42.000+02:00
diff --git a/README.md b/README.md
@@ -1,7 +1,7 @@
 The Grease Portability Library  [![Build Status](https://travis-ci.org/SeasideSt/Grease.png?branch=master)](https://travis-ci.org/SeasideSt/Grease)
 ======
 
-The main repository of Grease is on Smalltalkhub: (http://www.smalltalkhub.com/#!/~Seaside/Grease11). This repository mirrors it.
+Since version 1.3.0, this is the main repository of Grease. Versions older than 1.1.9 can be found in the [Smalltalkhub repository](http://www.smalltalkhub.com/#!/~Seaside/Grease11). Check out the [releases list](https://github.com/SeasideSt/Grease/releases) for all version numbers in this repository.
 
 Grease enhances the ANSI Smalltalk standard. With only a few exceptions, we assume platforms are fully ANSI-compliant. Platforms want to support Seaside and standardization makes this easier for the project’s developers and its porters.
 
