cosmetic changes to BurnableToken
cosmetic changes to BurnableToken

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