Added expdiff adjustment
Added expdiff adjustment

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