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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.