DEV: Bump black 21.6b0 -> 21.7b0

[pre-commit-ci]

updates:

• github.com/psf/black: 21.6b0 → 21.7b0

[codecov]

Codecov Report

Merging #258 (5470b48) into master (af2708e) will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #258      +/-   ##
==========================================
+ Coverage   94.12%   94.16%   +0.03%     
==========================================
  Files           8        8              
  Lines        1209     1217       +8     
  Branches      302      306       +4     
==========================================
+ Hits         1138     1146       +8     
  Misses         36       36              
  Partials       35       35              

Flag	Coverage Δ
nbsmoke	60.06% <ø> (+0.01%)	⬆️
unittests	93.83% <ø> (+0.04%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
fissa/core.py	96.60% <0.00%> (+0.04%)	⬆️

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