Remove beta tag from truffle
Remove beta tag from truffle

truffle@beta uses old solc 0.4.11
truffle main branch uses most up to date 0.4.15
OpenZeppelin/openzeppelin-contracts,dmx374/zeppelin-solidity,OpenZeppelin/zep-solidity,OpenZeppelin/zep-solidity,dmx374/zeppelin-solidity,pash7ka/zeppelin-solidity,pash7ka/zeppelin-solidity,OpenZeppelin/zeppelin-solidity,OpenZeppelin/zeppelin-solidity,OpenZeppelin/openzeppelin-contracts,OpenZeppelin/openzeppelin-contracts