Setupmeta

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* Report version as dirty if there staged (but uncommitted changes)

* Show pending changes (if there are any) in ``setup.py check`` command

* Added a test exercising ``pip wheel`` to expose recent ``dirty`` determination issue

* Rolled back ``dirty`` checkout determination, repo with staged files is considered clean again,
will have to find another fix for that edge case

* Push version bumps only when ``--push`` is explicitly specified

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* Always listify ``setup_requires``

* Better warnings message, should show proper origination

* Corrected ``dirty`` determination: repo with staged files is considered dirty until effective commit

* Extract all relevant info from ``PKG-INFO`` (not just version)

* Auto-fill ``bugtrack_url``

* Added support for version determination from PKG-INFO

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* Added ``version --show-next``

* Added ``{devcommit}`` versioning strategy token

* Added ``--expand`` to command ``explain``

* Better handling of unicode in ``README``-s and ``setup.py``-s

* Fixed setupmeta's own download_url

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* Show how many requirements_ were abstracted/skipped (if any) in ``setup.py check``

* Warn if current version tag mention patch while versioning strategy doesn't

* Make sure local tags match remote before pushing a new bumped version tag

* Auto-fill dependencies accordingly to recommendations in https://packaging.python.org/discussions/install-requires-vs-requirements/

* Added support for ``.dev`` versioning

* Added ``--dependencies`` to ``explain`` command

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* Auto-fill long_description_content_type when applicable

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* Test against python 3.7, dropped support for 3.4 as it's not available on travis Xenial

* Don't pass redundant ``bump`` cli arg to bump hook