Jarn.mkrelease

----------------

- Fix issue 10: Can no longer run from a zc.buildout.
[stefan]

- Support ``python -m jarn.mkrelease``.
[stefan]

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- Drop Python 2.6 support, add Python 3.7.
[stefan]

- Update wheel and keyring dependencies.
[stefan]

- Add a complete config file example to the README.
[stefan]

- Accept ``dist-location`` as alias for ``distdefault`` in config files.
[stefan]

- Convert dashes to underscores in config parser optionxform.
[stefan]

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- Add -m option to skip setuptools extensions.
[stefan]

- Never read existing ``SOURCES.txt`` files.
[stefan]

- Allow --egg as alias for --binary.
[stefan]

------------------

- Fix conditional include of keyring.
[stefan]

----------------

- Add support for source distributions in gztar format.
[stefan]

- Add support for wheel files.
[stefan]

- Allow multiple archive formats per release.
[stefan]

- Protect against bad or incomplete locale settings.
[stefan]

- The secondary thread would sometimes not terminate in Python 2.
[stefan]

-----------------

- Support setuptools >= 33.1.0.
[stefan]