minor cleanups to README
minor cleanups to README
BigRoss/learntris,SultansDream/testris,TylerLau/learntris,DTSCode/learntris-haskell,Larsharaldjoh/Tetris,Shamash2014/spice_and_html,WhitmanH/learntris,mosegontar/learntris,lochanaeg/learntris,Shamash2014/spice_and_html,nbgraham/learntris,TylerLau/learntris,LearnProgramming/learntris,tangentstorm/learntris,BigRoss/learntris,bschaef14/learntris,bschaef14/learntris,geugon/learntris,bschaef14/learntris,Shamash2014/spice_and_html