Add Chad to CONTRIBUTORS
Add Chad to CONTRIBUTORS

Change-Id: Id74c835a55f9369ddfd392c9a15cd01917dcff1b

ustudio/shaka-player,indiereign/shaka-player,shaka-project/shaka-player,vimond/shaka-player,shaka-project/shaka-player,Ross-cz/shaka-player,tvoli/shaka-player,shaka-project/shaka-player,Ross-cz/shaka-player,TobbeEdgeware/shaka-player,cmgrecu/shaka-player,brightcove/shaka-player,baconz/shaka-player,brightcove/shaka-player,baconz/shaka-player,TheModMaker/shaka-player,shaka-project/shaka-player,tvoli/shaka-player,TobbeEdgeware/shaka-player,ustudio/shaka-player,TheModMaker/shaka-player,cmgrecu/shaka-player,vimond/shaka-player,ustudio/shaka-player,russitto/shaka-player,russitto/shaka-player,TheModMaker/shaka-player,TobbeEdgeware/shaka-player,vimond/shaka-player,tvoli/shaka-player,indiereign/shaka-player,ustudio/shaka-player,TheModMaker/shaka-player,tvoli/shaka-player,russitto/shaka-player,indiereign/shaka-player,Ross-cz/shaka-player,cmgrecu/shaka-player,brightcove/shaka-player,baconz/shaka-player