Update README.md

Author: matthew-dean

README.md

@@ -1,4 +1,4 @@
-### This is the Less 3.0 Alpha branch (non-production ready). For the stable branch of Less, go [here](https://github.com/less/less.js/tree/master).
+### This is the Less 3.0 Edge branch. For the stable (2.x) branch of Less, go [here](https://github.com/less/less.js/tree/master).
 
 
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