[ENH] Add test steps and explicit support for Python 3.9

[JulioAPeraza]

Closes #575.

Changes proposed in this pull request:

• Support Python version 3.9. Create and add a new job for 3.9 in the CircleCI config file.

[tsalo]

There seems to be a problem installing NiMARE in 3.9 and 3.10. Is it possible that our minimum version of setuptools in pyproject.toml needs to be bumped up?

[JulioAPeraza]

Updating the version fixed the issue. Should we use the latest release (setuptools==58.2.0)?

[tsalo]

If it still works for Python 3.6, then yes. Otherwise, I'd like to determine the most recent version that works for all Python versions we support.

[JulioAPeraza]

It seems like numpy has not released a wheel for Python 3.10.

[tsalo]

Darn... it seems like we'll have to wait until they release it. Would you rather add 3.9 support in this PR and tackle 3.10 later, or just wait to merge this?

[JulioAPeraza]

I would add 3.9 support in this PR and tackle 3.10 later. The numpy wheel may be out by next month, but any issues with a different package in 3.10 may delay the 3.9 support.

[tsalo]

That works for me.

[tsalo]

Can you do two things:

1. Change all instances of deps9 to deps10 in the CircleCI config file? That will create a new cache, which should have the fixed version of flake8-isort.
2. Rename the PR and update the summary to make it clear that 3.10 isn't being added.

[tsalo]

Thanks! 🤞 Here's hoping CI passes without issue.

EDIT: And if it does I'll approve and merge.

[codecov]

Codecov Report

Merging #578 (da49d80) into main (e8814c2) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #578   +/-   ##
=======================================
  Coverage   85.82%   85.82%           
=======================================
  Files          39       39           
  Lines        4267     4267           
=======================================
  Hits         3662     3662           
  Misses        605      605           

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[tsalo]

LGTM!