Black

• Document stability policy, that will apply for non-beta releases (#2529)
• Add new --workers parameter (#2514)
• Fixed feature detection for positional-only arguments in lambdas (#2532)
• Bumped typed-ast version minimum to 1.4.3 for 3.10 compatiblity (#2519)
• Fixed a Python 3.10 compatibility issue where the loop argument was still being passed even though it has been removed (#2580)
• Deprecate Python 2 formatting support (#2523)

Blackd

• Remove dependency on aiohttp-cors (#2500)
• Bump required aiohttp version to 3.7.4 (#2509)

Black-Primer

• Add primer support for --projects (#2555)
• Print primer summary after individual failures (#2570)

Integrations

• Allow to pass target_version in the vim plugin (#1319)
• Install build tools in docker file and use multi-stage build to keep the image size down (#2582)