Update note about branches in CONTRIBUTING
Update note about branches in CONTRIBUTING

phatblat/Nimble,feinstruktur/Nimble,phatblat/Nimble,AnthonyMDev/Nimble,mishimay/Nimble,AnthonyMDev/Nimble,Quick/Nimble,feinstruktur/Nimble,dgdosen/Nimble,abbeycode/Nimble,Quick/Nimble,abbeycode/Nimble,DanielAsher/Nimble,ashfurrow/Nimble,dgdosen/Nimble,mishimay/Nimble,jeffh/Nimble,DanielAsher/Nimble,dgdosen/Nimble,Quick/Nimble,ashfurrow/Nimble,AnthonyMDev/Nimble,abbeycode/Nimble,jeffh/Nimble,phatblat/Nimble,jeffh/Nimble,DanielAsher/Nimble,abbeycode/Nimble,twobitlabs/Nimble,mishimay/Nimble,ashfurrow/Nimble,feinstruktur/Nimble,twobitlabs/Nimble,twobitlabs/Nimble,dgdosen/Nimble,jeffh/Nimble