replace var by uint256 in StandardToken. Fix #432
replace var by uint256 in StandardToken. Fix #432

OpenZeppelin/zep-solidity,pash7ka/zeppelin-solidity,OpenZeppelin/zep-solidity,OpenZeppelin/zeppelin-solidity,OpenZeppelin/openzeppelin-contracts,OpenZeppelin/openzeppelin-contracts,OpenZeppelin/openzeppelin-contracts,pash7ka/zeppelin-solidity,OpenZeppelin/zeppelin-solidity