Update README.md

adding `medialize/jQuery-contextMenu` travis-ci build system

Author: jzelenkov

README.md

@@ -1,6 +1,6 @@
 # jQuery contextMenu plugin & polyfill #
 
-[![Travis Build Status](https://travis-ci.org/jzelenkov/jQuery-contextMenu.svg?branch=master)](https://travis-ci.org/jzelenkov/jQuery-contextMenu)
+[![Travis Build Status](https://travis-ci.org/medialize/jQuery-contextMenu.svg?branch=master)](https://travis-ci.org/medialize/jQuery-contextMenu)
 
 $.contextMenu is a management facility for - you guessed it - context menus. It was designed for an application where there are hundreds of elements that may show a context menu - so intialization speed and memory usage are kept fairly small. It also allows to register context menus without providing actual markup, as $.contextMenu generates DOMElements as needed.