Separate mapping keyword by whitespace (#2287)
Separate mapping keyword by whitespace (#2287)

Co-authored-by: pm_468 <00bc4d0d050eee38edbb3c698ff8a7fb4cad757d@lindenvalley.de>
OpenZeppelin/openzeppelin-contracts,OpenZeppelin/zep-solidity,OpenZeppelin/zep-solidity,OpenZeppelin/openzeppelin-contracts,OpenZeppelin/zeppelin-solidity,OpenZeppelin/openzeppelin-contracts,OpenZeppelin/zeppelin-solidity