Add contributors to README.
Add contributors to README.

tansaku/reek,tansaku/reek,nTraum/reek,andyw8/reek,weby/reek,weby/reek,HParker/reek,tansaku/reek,nTraum/reek,andyw8/reek,troessner/reek,apuratepp/reek,apuratepp/reek,troessner/reek,HParker/reek,apuratepp/reek,HParker/reek,weby/reek,andyw8/reek,skywinder/reek,skywinder/reek,skywinder/reek