Update README.md

Author: lewisgoddard

README.md

@@ -6,7 +6,7 @@ Built for all the short dialogs, alerts, panels and such associated with an app,
 
 ###### Based on leanModal v1.1 by Ray Stone - http://finelysliced.com.au
 
-### Differences between v1.1 and v2.0
+### Differences between v1.1 and v2.1
 This fork of the original leanModal contains many fixes and improvements, and as such may not be entirely backwards compatible with the previous version. It is recommended you test your implementation before deployment.
 
 - Bug: Fixes bug where an overlay is added with every call. Now, if one exists a new one is not added.