Remove unnecessary toString calls
Remove unnecessary toString calls

pash7ka/zeppelin-solidity,OpenZeppelin/zeppelin-solidity,OpenZeppelin/openzeppelin-contracts,OpenZeppelin/openzeppelin-contracts,OpenZeppelin/zeppelin-solidity,OpenZeppelin/openzeppelin-contracts,dmx374/zeppelin-solidity,pash7ka/zeppelin-solidity,maraoz/zeppelin-solidity,AragonOne/zeppelin-solidity,OpenZeppelin/zep-solidity,dmx374/zeppelin-solidity,OpenZeppelin/zep-solidity,maraoz/zeppelin-solidity,AragonOne/zeppelin-solidity