Removed unnecessary Secondary inheritance from RefundEscrow. (#1381)
Removed unnecessary Secondary inheritance from RefundEscrow. (#1381)


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