mypy annotations

[tony]

https://github.com/tmux-python/libtmux/pull/382

[codecov[bot]]

Codecov Report

Merging #786 (f130e9b) into master (17caa0c) will not change coverage. The diff coverage is 76.92%.

@@           Coverage Diff           @@
##           master     #786   +/-   ##
=======================================
  Coverage   75.19%   75.19%           
=======================================
  Files          18       18           
  Lines        1431     1431           
  Branches      337      337           
=======================================
  Hits         1076     1076           
  Misses        267      267           
  Partials       88       88           

Impacted Files	Coverage Δ
tmuxp/cli/shell.py	88.57% <0.00%> (ø)
tmuxp/cli/freeze.py	71.83% <33.33%> (ø)
docs/conf.py	57.60% <100.00%> (+0.46%)	:arrow_up:
tmuxp/conftest.py	86.58% <100.00%> (-0.17%)	:arrow_down:
tmuxp/util.py	84.41% <100.00%> (ø)

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