REL: 4.0.0rc0

[effigies]

Preparation for 4.0.0rc0. As noted in #1078, the prospect of many deprecations needing to be double-checked has slowed down my ability to make this release happen. It still needs to happen, and it should start with a release candidate.

We've jumped a few numpy versions and dropped Python 3.6, and we have some improvements that will make things easier for downstream projects.

I think let's aim for next Monday to give everyone time to polish off enhancement/new feature PRs. Additional bug fixes can come post-release.

Pre-release checklist

• Review the open list of nibabel issues. Check whether there are outstanding issues that can be closed, and whether there are any issues that should delay the release. Label them!
• Review and update the release notes. Review and update the Changelog file.
• Look at doc/source/index.rst and add any authors not yet acknowledged.
• Use the opportunity to update the .mailmap file if there are any duplicate authors listed from git shortlog -nse.
• Check the copyright year in doc/source/conf.py
• Refresh the README.rst text from the LONG_DESCRIPTION in info.py by running make refresh-readme.
• Check the dependencies listed in setup.cfg (e.g., install_requires, options.extras_require) and in doc/source/installation.rst and in requirements.txt and .travis.yml. They should at least match. Do they still hold? Make sure nibabel on travis is testing the minimum dependencies specifically.
• Make sure all tests pass (from the nibabel root directory): pytest --doctest-modules nibabel

Adapted from http://nipy.org/nibabel/devel/make_release.html#release-checklist

[codecov]

Codecov Report

Merging #1081 (1312493) into master (1312493) will not change coverage.
The diff coverage is n/a.

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  Coverage   92.30%   92.30%           
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  Lines       12342    12342           
  Branches     2419     2419           
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  Hits        11392    11392           
  Misses        625      625           
  Partials      325      325           

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[effigies]

I think let's aim for next Monday to give everyone time to polish off enhancement/new feature PRs.

Well that sure didn't happen. But the plan is now to aim for this coming Monday, June 6.