refine gitignore
refine gitignore

inzem77/pyethereum,pipermerriam/pyethereum,ethereum/pyethereum,karlfloersch/pyethereum,karlfloersch/pyethereum,ethereum/pyethereum,shahankhatch/pyethereum,ckeenan/pyethereum,ebuchman/daoist_protocol,ebuchman/daoist_protocol,vaporry/pyethereum,jnnk/pyethereum,ethermarket/pyethereum,ddworken/pyethereum,holiman/pyethereum,harlantwood/pyethereum,pipermerriam/pyethereum,ethers/pyethereum,shahankhatch/pyethereum