Update CONTRIBUTING.md
Update CONTRIBUTING.md
arno01/cryptocat,wakermahmud/cryptocat,Raynes/cryptocat,PeterDaveHello/cryptocat,wakermahmud/cryptocat,Raynes/cryptocat,PeterDaveHello/cryptocat,Raynes/cryptocat,Cryptodog/cryptocat,Cryptodog/cryptocat,arno01/cryptocat