Check-manifest

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- Add Python 3.7 support.

- Drop Python 3.4 support.

- Added GitHub templates to default ignore patterns.

- Added reading check-manifest config out of ``tox.ini`` or ``pyproject.toml``.

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- Drop Python 3.3 support.

- Support packages using ``setuptools_scm``
(`68 <https://github.com/mgedmin/check-manifest/issues/68>`__).

Note that ``setuptools_scm`` usually makes MANIFEST.in files obsolete.
Having one is helpful only if you intend to build an sdist and then use that
sdist to perform further builds, instead of building from a source checkout.

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- Handle empty VCS repositories more gracefully
(`84 <https://github.com/mgedmin/check-manifest/issues/84>`__).

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- Python 3.6 support.

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- Fix WindowsError due to presence of read-only files
(`74 <https://github.com/mgedmin/check-manifest/issues/74>`__).

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- Fix WindowsError due to git submodules in subdirectories
(`73 <https://github.com/mgedmin/check-manifest/pull/73>`__).
Contributed by Loren Gordon.