Update CREDITS.
Update CREDITS.

zsulocal/pycoin,Kefkius/pycoin,gitonio/pycoin,moocowmoo/pycoin,Treefunder/pycoin,gitonio/pycoin,lekanovic/pycoin,shivaenigma/pycoin,Magicking/pycoin,XertroV/pycoin,antiface/pycoin,mperklin/pycoin,Magicking/pycoin,mperklin/pycoin,Bluejudy/pycoin,Tetchain/pycoin,richardkiss/pycoin,pycoin/pycoin,shayanb/pycoin,thirdkey-solutions/pycoin,tomholub/pycoin,tomholub/pycoin,shivaenigma/pycoin,devrandom/pycoin,XertroV/pycoin,zsulocal/pycoin,Pan0ram1x/pycoin,Kefkius/pycoin,shayanb/pycoin,ptcrypto/pycoin,lekanovic/pycoin,moocowmoo/pycoin,ptcrypto/pycoin,pycoin/pycoin,Tetchain/pycoin,devrandom/pycoin,Treefunder/pycoin,thirdkey-solutions/pycoin,Pan0ram1x/pycoin,richardkiss/pycoin,antiface/pycoin,Bluejudy/pycoin