Merge pull request #1086 from m-ahmadi/patch-1

corrected a typo in readme.md

Author: Alain Dumesny

README.md

@@ -122,7 +122,7 @@ $(function () {
 
 ## Migrating to v0.3.0
 
-As of v0.3.0, gridstack introduces a new plugin system. The drag'n'drop functionality has been modified to take advantage of this system. Because of this, and to avoid dependency on core code from jQuery UI, the plugin was functionality was moved to a separate file.
+As of v0.3.0, gridstack introduces a new plugin system. The drag'n'drop functionality has been modified to take advantage of this system. Because of this, and to avoid dependency on core code from jQuery UI, the plugin functionality was moved to a separate file.
 
 To ensure gridstack continues to work, either include the additional `gridstack.jQueryUI.js` file into your HTML or use `gridstack.all.js`: