Co-authored-by: Tzu-ping Chung <uranusjr@gmail.com>
Co-authored-by: Pradyun Gedam <pradyunsg@gmail.com>
Co-authored-by: Brett Cannon <brett@python.org>

Fixes #486 by avoiding the version of pyparsing that broke packaging.

* Run pyupgrade --py36-plus on all files

This should update the codebase to use modern Python 3 features.

* Drop all `__ne__` methods

This is no longer necessary, since Python 2 support has been dropped.

Co-authored-by: Pradyun Gedam <pradyunsg@users.noreply.github.com>
Co-authored-by: Brett Cannon <brett@python.org>

Co-authored-by: Pradyun Gedam <pradyunsg@gmail.com>

I forgot to do this, when I made the release. :)

Co-authored-by: Pradyun Gedam <pradyunsg@users.noreply.github.com>
Co-authored-by: Brett Cannon <brett@python.org>

This passes through the type of a list in filter.

Example:

    x: typing.List[Version]
    reveal_type(SpecifierSet("*").filter(x))

Before:

    Revealed type is 'typing.Iterable[Union[packaging.version.Version, packaging.version.LegacyVersion, builtins.str]]'

After:

    Revealed type is 'typing.Iterable[packaging.version.Version*]'

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>