Update contributing with gitflow.
Update contributing with gitflow.

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