Update README.md

Update link to V2 docs.

Author: lionettiluca

README.md

@@ -1,6 +1,6 @@
 # Statamic 2 Documentation
 
 This repo holds the content for the Statamic v2 docs site.
-[http://docs.statamic.com](http://docs.statamic.com)
+[https://v2.statamic.com](https://v2.statamic.com)
 
 Any commits made to this repo's `master` branch will be reflected on the site.