Introduce black formatter

[giampaolo]

No description provided.

[codecov]

Codecov Report

Attention: 54 lines in your changes are missing coverage. Please review.

Comparison is base (99b055b) 66.40% compared to head (b66aaf9) 66.42%.

Files	Patch %	Lines
pyftpdlib/handlers.py	60.97%	16 Missing ⚠️
pyftpdlib/servers.py	40.00%	9 Missing ⚠️
pyftpdlib/authorizers.py	55.55%	8 Missing ⚠️
pyftpdlib/ioloop.py	64.28%	5 Missing ⚠️
pyftpdlib/log.py	0.00%	5 Missing ⚠️
pyftpdlib/_asynchat.py	20.00%	4 Missing ⚠️
pyftpdlib/_asyncore.py	50.00%	3 Missing ⚠️
pyftpdlib/filesystems.py	75.00%	2 Missing ⚠️
pyftpdlib/__main__.py	92.30%	1 Missing ⚠️
pyftpdlib/prefork.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #621      +/-   ##
==========================================
+ Coverage   66.40%   66.42%   +0.02%     
==========================================
  Files          11       11              
  Lines        4164     4164              
==========================================
+ Hits         2765     2766       +1     
+ Misses       1399     1398       -1     

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