Black: Format w/ string normalization

[tony]

No description provided.

[codecov]

Codecov Report

Merging #354 (5c7fc21) into master (04f6f8c) will not change coverage.
The diff coverage is 84.21%.

@@           Coverage Diff           @@
##           master     #354   +/-   ##
=======================================
  Coverage   87.82%   87.82%           
=======================================
  Files          15       15           
  Lines        1511     1511           
=======================================
  Hits         1327     1327           
  Misses        184      184           

Impacted Files	Coverage Δ
libtmux/formats.py	100.00% <ø> (ø)
libtmux/test.py	42.85% <44.44%> (ø)
libtmux/server.py	79.31% <62.22%> (ø)
libtmux/pane.py	82.35% <66.66%> (ø)
libtmux/session.py	81.54% <67.50%> (ø)
libtmux/window.py	84.33% <70.00%> (ø)
tests/conftest.py	85.10% <80.00%> (ø)
libtmux/common.py	86.93% <80.64%> (ø)
tests/test_common.py	98.26% <95.34%> (ø)
tests/test_session.py	98.51% <97.91%> (ø)
... and 4 more

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