Make sure to read the release notes for the first and second release candidates!
This third release candidate adds events to roles on construction and when renouncing (#1329), improves tests to achieve 100% coverage (#1249, #1349, #1351, #1350, #1360, #1248, #1318), separates ERC721Mintable into two contracts, one with metadata (token URI) and one without (#1365), prevents BreakInvariantBounty from being reclaimed (#1374), adds an ERC20 internal _transfer function (#1370) and removes an unnecessary ERC20 _burn override (#1373) and inheritance in RefundEscrow (#1381).