add changes to minimum solidity compiler version in the changelog
add changes to minimum solidity compiler version in the changelog

(cherry picked from commit bddbbe99a73353a959a001ab455490a85003de94)

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