Release Checklist
-----------------------------------------
[ ] Update __version__ string
[ ] Update classifiers in setup.py to include the latest supported Python
    versions.
[ ] Update the metadata in zonefile_metadata.json to include the latest tzdata
    release from https://www.iana.org/time-zones.
[ ] If necessary, update the tzdata mirror at https://github.com/dateutil/tzdata
[ ] Update NEWS with list of changes, giving credit to contributors.
[ ] Build the source distribution as, at a minimum, .tar.gz and .zip
[ ] Verify that the source distribution contains all necessary components.
[ ] Build the binary distribution as a wheel
[ ] Verify that the binary distribution can be installed and works.
[ ] Generate MD5 hashes for the source and binary distributions
[ ] Sign the source and binary distributions with a GPG key (if not the one
    that made the release, then one signed by the one that made the last
    release)
[ ] Commit the changes in git and make a pull request.
[ ] Accept the pull request and tag the repository with the release number.
[ ] Add the contents of the NEWS file to the github release notes for the
    release.
[ ] Upload the source and binary distributions along with hashes and signatures
    to pypi.

Optional:
----------
[ ] Check that README.rst is up-to-date.
[ ] Check that the documentation builds correctly (cd docs, make html)


Instructions
-----------------------------------------
See the instructions at https://packaging.python.org/en/latest/distributing/
for more details.


Versioning
----------
Try and keep to a semantic versioning scheme (http://semver.org/).


Source releases
----------
Release the sources with, at a minimum, .tar.gz and .zip. Make sure you have a
relatively recent version of setuptools when making the source distribution, as
earlier version will not include the tests. Other formats are
optional. They can be generated using:

    python setup.py sdist --formats=zip,gztar

To verify that a source release is correct, inspect it using whatever archive
utility you have and make sure it contains all the modules and the tests. Also
make sure that the zoneinfo file is included in the You
may also want to generate a new clean virtualenv and run the tests from the
source distribution (python setup.py test).


Binary releases
----------
It should always be possible to generate a universal wheel binary distribution
for each release. Generally we do not generate .egg files. In order to generate
a wheel, you need the wheel package (https://wheel.readthedocs.io/en/latest/)
installed, which can be installed with:

    pip install wheel

Once this is done, generate the wheel with:

    python setup.py bdist_wheel


Signing and generate checksums
----------
Since all the outputs are generated in the dist/ directory, can generate all the
md5 checksums at once from the base directory by executing:

    md5sum dist/*

Save these for when uploading the files. Following this, go into the dist
directory and sign each of the results with the relevant key:

    gpg --armor --output <fname>.asc --detach-sig <fname>

To automate this for all files, you can use the following command:

    for f  in dist/*; do gpg --armor --output $f.asc --detach-sig $f; done

Save these .asc files for when uploading to pypi. Before uploading them, verify
that they are valid signatures:

    gpg --verify <fname>.asc <fname>

To do this in bulk, you can use the command:

    for f in $(find ./dist -type f | grep -v '.asc$'); do gpg --verify $f.asc $f; done