Sncosmo

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This release mostly involves modernizing the SNCosmo build system.

- Add Pan-STARRS1 bandpasses (212)

- Added support for wheels which should now be automatically uploaded to PyPI
for any new release (304).

- Fixed the Zenodo integration. New SNCosmo releases should now automatically
be archived to Zenodo.

- Moved citations to the new CITATION.cff format. GitHub and Zenodo will now
provide BibTeX entries that can be used to cite SNCosmo (302).

- Update to the emcee version 3 API. Now only compatible with emcee>=3.

- Migrate from Travis CI to GitHub Actions for continuous integration/tests
(293).

- Bugfixes:

- Fixed the implementation of the SALT3 error model (300).

- Fixed numpy type deprecations.

- Fixed the documentation for models (299).

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- Add SALT3 model from Kenworthy et al. (2021)

- Various documentation fixes

===================

- Add SUGAR model from Leget et al. (2020)

- Add support for the iminuit 2.0 API (291).

- Update tox to work with any version of Python 3.

- Bugfixes:

- Fix flatten_result bug due to API change (285).

===================

- Add Swift UVOT bandpasses.

- Bugfixes:

- Fix segfaults in bicubic interpolation.

===================

- Add core-collapse models from Vincenzi et al. (2019)

- New Spectrum class to handle processing and fitting spectral observations.

- Removed appveyor builds.

- Bugfixes:

- Prevent segfaults in light curve fitting when the minuit fit fails.

===================

- Add ZTF transmission functions

- Bugfixes

- Corrected pyproject.toml; should help cases where the wrong numpy
version was being installed.

- Remove all references to the six package

- Fix accidental mutation of ``bounds`` inputs in ``fit_lc`` and
``mcmc_lc``.