Add black to pre-commit hooks. Fixes: #616

[SukiCZ]

• Add black to pre-commit hooks

• Apply black formatting to codebase

[codecov]

Codecov Report

Attention: Patch coverage is 79.85075% with 81 lines in your changes missing coverage. Please review.

Project coverage is 87.10%. Comparing base (b2bb4df) to head (ada64b8).
Report is 12 commits behind head on master.

Files with missing lines	Patch %	Lines
silk/request_filters.py	62.96%	10 Missing ⚠️
silk/models.py	76.47%	8 Missing ⚠️
silk/code_generation/curl.py	30.00%	7 Missing ⚠️
silk/model_factory.py	84.44%	7 Missing ⚠️
silk/templatetags/silk_filters.py	46.15%	7 Missing ⚠️
silk/profiling/dynamic.py	75.00%	5 Missing ⚠️
silk/profiling/profiler.py	68.75%	5 Missing ⚠️
silk/views/profiling.py	84.37%	5 Missing ⚠️
silk/collector.py	84.21%	3 Missing ⚠️
silk/views/cprofile.py	0.00%	3 Missing ⚠️
... and 12 more

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #764   +/-   ##
=======================================
  Coverage   87.10%   87.10%           
=======================================
  Files          52       52           
  Lines        2141     2141           
=======================================
  Hits         1865     1865           
  Misses        276      276           

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