22.1.0

• extend Y001 to cover ParamSpec and TypeVarTuple in addition to TypeVar
• detect usage of non-integer indices in sys.version_info checks
• extend Y010 to check async functions in addition to normal functions
• extend Y010 to cover what was previously included in Y090 (disallow
  assignments in __init__ methods) and Y091 (disallow raise
  statements). The previous checks were disabled by default.
• introduce Y016 (duplicate union member)
• introduce Y017 (disallows assignments with multiple targets or non-name targets)
• introduce Y018 (detect unused TypeVars)
• introduce Y019 (detect TypeVars that should be _typeshed.Self, but aren't)
• introduce Y020 (never use quoted annotations in stubs)
• introduce Y021 (docstrings should not be included in stubs)
• introduce Y022 (prefer stdlib classes over typing aliases)
• introduce Y023 (prefer typing over typing_extensions)
• introduce Y024 (prefer typing.NamedTuple to collections.namedtuple)
• introduce Y026 (require using TypeAlias for type aliases)
• introduce Y025 (always alias collections.abc.Set)
• introduce Y027 (Python 2-incompatible extension of Y022)
• introduce Y028 (Use class-based syntax for NamedTuples)
• introduce Y029 (never define __repr__ or __str__)
• introduce Y030 (use Literal['foo', 'bar'] instead of Literal['foo'] | Literal['bar'])
• introduce Y031 (use class-based syntax for TypedDicts where possible)
• all errors are now enabled by default
• remove Y092 (top-level attribute must not have a default value)
• attrs is no longer a dependency
• ast_decompiler has been added as a dependency on Python 3.8 and 3.7
• support Python 3.10
• discontinue support for Python 3.6