Add fix for the approve() mitigation.
Add fix for the approve() mitigation.

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