Update eth.py
Update eth.py

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