Change http://bit.ly/phet-html5-development-overview to https://githu…

…b.com/phetsims/phet-info/blob/master/doc/phet-development-overview.md, see phetsims/phet-info#120

README.md

@@ -7,7 +7,7 @@ By PhET Interactive Simulations
 http://phet.colorado.edu/
 
 ### Documentation
-The [PhET Development Overview](http://bit.ly/phet-html5-development-overview) is the most complete guide to PhET Simulation Development. This guide includes how
+The [PhET Development Overview](https://github.com/phetsims/phet-info/blob/master/doc/phet-development-overview.md) is the most complete guide to PhET Simulation Development. This guide includes how
 to obtain simulation code and its dependencies, notes about architecture & design, how to test and build the sims, as well as other important information.
 
 ### License