remove unused strorage when updating
remove unused strorage when updating

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