Description

Release Candidate for version 0.4.0. Major changes include:

Type of change

Please delete options that are not relevant.

Bug fix (non-breaking change which fixes an issue)
New feature (non-breaking change which adds functionality)
Breaking change (fix or feature that would cause existing functionality to not work as expected)
This change requires a documentation update

Ran unit tests locally, ran doc examples.

Operating system: OS X Big Sur
Version number: Python 3.9
Any details about your local setup that are relevant: develop branch of pysat, functioning ssj_auroral_boundaries

[x] Update the version number
[x] Verify and update Zenodo information in .zenodo.json
[x] doc tests pass locally
[x] Upload the test distribution to the testPyPi server
[x] Contacted developers and users about the future release
[x] Performed integration tests with downstream packages (include list of these packages)
[x] My commits are formatted appropriately (following the SciPy/NumPy style)
[x] My code follows the style guidelines of this project
[x] I have performed a self-review of my own code
[x] I have commented my code, particularly in hard-to-understand areas
[x] I have made corresponding changes to the documentation
[x] My changes generate no new warnings
[x] I have added tests that prove my fix is effective or that my feature works
[x] New and existing unit tests pass locally with my changes
[x] Any dependent changes have been merged and published in downstream modules
[x] Add a note to Changelog.rst, summarising the changes
[x] Add yourself to AUTHORS.rst and .zenodo.json