v4.0.0

⚠ BREAKING CHANGES

• add bytes dataValue parameter to DataChanged event in ERC725Y (ERC725Alliance#163)
• removed custom Initializable contract (ERC725Alliance#150)
• removed GasLib library in favour of internal uncheckedIncrement(...) function (ERC725Alliance#160)

Features

• add bytes dataValue parameter to DataChanged event in ERC725Y (#163) (9f88ee0)

Bug Fixes

• [QSP-4] prevent address(0) to be set as contract owner on deployment (#159) (5c47854)