revert to usig npm as preferred installation method
revert to usig npm as preferred installation method

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