v4.1.0

What's Changed

• Restructure tests to use subtests by @iand in #63
• sync: update CI config files by @web3-bot in #66
• feat: implement parallel diffing by @frrist in #67
• fix: pass workers to diff scheduler by @frrist in #68
• Use cbor-gen readers and writers by @iand in #65
• sync: update CI config files by @web3-bot in #70
• chore: bump version to 4.1.0 by @rvagg in #71

Full Changelog: v4.0.0...v4.1.0