v0.21.0

What's Changed

• Fix tach-ignore on preceding line for non-top-level imports by @emdoyle in #547
• Extract ignore logic from import visitor by @emdoyle in #548
• Fix unused_ignore_directives rule when ignore directive does not apply to any import by @emdoyle in #549
• Fix unused_ignore_directives on redundant tach-ignore by @emdoyle in #550
• Higher layers auto-allow dependencies on lower layers by @emdoyle in #545
• Make depends_on optional by @emdoyle in #546
• prompt for username instead of using configreader by @caelean in #551
• Deprecate use_regex_matching by @emdoyle in #552
• Auto migrate default exclude regexes by @emdoyle in #553

Full Changelog: v0.20.0...v0.21.0