STY: Change code style to black

[scottclowe]

Change code style to black and sort imports.

• Run black and isort on the codebase
• Add pre-commit hooks for isort, black, and blacken_docs so the code style is automatically maintained

[codecov[bot]]

Codecov Report

Merging #215 (ec7b531) into master (16768ed) will decrease coverage by 0.01%. The diff coverage is 82.00%.

@@            Coverage Diff             @@
##           master     #215      +/-   ##
==========================================
- Coverage   93.24%   93.23%   -0.02%     
==========================================
  Files           8        8              
  Lines         918      916       -2     
  Branches      184      184              
==========================================
- Hits          856      854       -2     
  Misses         32       32              
  Partials       30       30              

Flag	Coverage Δ
nbsmoke	66.70% <38.00%> (-0.08%)	:arrow_down:
unittests	92.79% <82.00%> (-0.02%)	:arrow_down:

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Impacted Files	Coverage Δ
fissa/roitools.py	90.22% <30.00%> (ø)
fissa/core.py	95.71% <80.00%> (-0.02%)	:arrow_down:
fissa/readimagejrois.py	91.34% <88.52%> (-0.05%)	:arrow_down:
fissa/ROI.py	78.26% <100.00%> (ø)
fissa/__meta__.py	100.00% <100.00%> (ø)
fissa/deltaf.py	100.00% <100.00%> (ø)
fissa/extraction.py	95.04% <100.00%> (ø)

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