Update README.md

Author: magefan

README.md

@@ -9,7 +9,7 @@ Move all javascripts to the footer.
   * To enable or disable extension please navigate to Magento 2 Admin Panel > Stores > Magefan Extensions > Rocket JavaScript
 
 ## Requirements
-  * Magento Community Edition 2.1.x or Magento Enterprise Edition 2.1.x
+  * Magento Community Edition 2.1.x-2.2.x or Magento Enterprise Edition 2.1.x-2.2.x
 
 ## Installation Method 1 - Installing via composer
   * Open command line