Drop python 3.7

[nstarman]

Signed-off-by: Nathaniel Starkman (@nstarman) [email protected]

To match astropy.

PR Checklist

• Check out the contributing guidelines and code of conduct
• Check out the contributing workflow ( for a practical example click here )
• Give a detailed description of the PR above.
• Document changes in the CHANGES.rst file. See existing changelog for examples.
• Add tests, if applicable, to ensure code coverage never decreases.
• Make sure the docs are up to date, if applicable, particularly the docstrings and RST files in docs folder.
• Ensure linear history by rebasing, when requested by the maintainer.

[review-notebook-app]

Check out this pull request on 

See visual diffs & provide feedback on Jupyter Notebooks.

---

Powered by ReviewNB

[codecov]

Codecov Report

Merging #64 (7665361) into main (3b17b6e) will decrease coverage by 16.04%.
The diff coverage is 58.06%.

@@             Coverage Diff             @@
##             main      #64       +/-   ##
===========================================
- Coverage   88.28%   72.23%   -16.05%     
===========================================
  Files          33       33               
  Lines        1673     1675        +2     
===========================================
- Hits         1477     1210      -267     
- Misses        196      465      +269     

Impacted Files	Coverage Δ
discO/core/__init__.py	100.00% <ø> (ø)
discO/core/common.py	100.00% <ø> (ø)
discO/core/pipeline.py	87.78% <ø> (ø)
discO/plugin/__init__.py	55.55% <ø> (-22.23%)	⬇️
discO/plugin/agama/__init__.py	0.00% <ø> (ø)
discO/plugin/agama/fitter.py	0.00% <0.00%> (ø)
discO/plugin/agama/sample.py	0.00% <0.00%> (ø)
discO/plugin/agama/type_hints.py	0.00% <ø> (ø)
discO/plugin/agama/wrapper.py	0.00% <ø> (ø)
discO/plugin/gala/__init__.py	0.00% <ø> (-100.00%)	⬇️
... and 35 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 3b17b6e...7665361. Read the comment docs.