Update README.md

Author: monkstone

README.md

@@ -27,4 +27,4 @@ Many of the vanilla processing example sketches have been translated to ruby-pro
 [Libraries]:https://github.com/ruby-processing/Example-Sketches/tree/master/samples/processing_app/libraries
 [fastmath]:https://github.com/ruby-processing/Example-Sketches/tree/master/samples/processing_app/libraries/fastmath
 [vecmath]:https://github.com/ruby-processing/Example-Sketches/tree/master/samples/processing_app/libraries/vecmath
-[control-panel]:https://github.com/ruby-processing/Example-Sketches/tree/master/samples/processing_app/libraries/control-panel
+[control-panel]:https://github.com/ruby-processing/Example-Sketches/tree/master/samples/contributed/jwishy.rb