contrib update

README.md

@@ -872,6 +872,7 @@ If you have personal support questions use [StackOverflow](http://stackoverflow.
   - Single-quoted strings
 - Should be made towards the **dev branch**
 - Should be submitted from a feature/topic branch (not your master)
+- Should not include the minified **reveal.min.js** file
 
 
 ## License