Black formatting

[ericpre]

Progress of the PR

• Run black on source code
• add black linting github actions - see https://black.readthedocs.io/en/stable/integrations/github_actions.html
• ready for review.

[codecov-commenter]

Codecov Report

Merging #78 (437b3b3) into master (c7dd36e) will increase coverage by 0.07%.
The diff coverage is 88.19%.

@@            Coverage Diff             @@
##           master      #78      +/-   ##
==========================================
+ Coverage   92.36%   92.43%   +0.07%     
==========================================
  Files          12       12              
  Lines         537      542       +5     
==========================================
+ Hits          496      501       +5     
  Misses         41       41              

Impacted Files	Coverage Δ
lumispy/signals/__init__.py	100.00% <ø> (ø)
lumispy/signals/cl_transient.py	100.00% <ø> (ø)
lumispy/signals/el_spectrum.py	100.00% <ø> (ø)
lumispy/signals/luminescence_transient.py	100.00% <ø> (ø)
lumispy/signals/pl_spectrum.py	100.00% <ø> (ø)
lumispy/signals/pl_transient.py	100.00% <ø> (ø)
lumispy/utils/axes.py	84.10% <81.48%> (+0.21%)	⬆️
lumispy/signals/luminescence_spectrum.py	89.20% <83.72%> (ø)
lumispy/signals/cl_spectrum.py	97.01% <86.66%> (ø)
lumispy/release_info.py	100.00% <100.00%> (ø)
... and 2 more

---

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[jlaehne]

@ericpre do you have an idea, why only the py3.8 coverage test run fails?

[ericpre]

This build is using the non_uniform_axes branch and there is a bug somewhere, which can be either in join_spectra or the non_uniform_axes branch. It would be good to figure it out!

[jlaehne]

Thanks, I did not realize that only this one test is running on the non_uniform_axes branch. Ends up in a nice catch for that branch. Fixed in hyperspy/hyperspy#2765