exclude version test from tox
exclude version test from tox

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