Basic mypy typings

[tony]

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[codecov]

Codecov Report

Merging #382 (94cf8fd) into master (92acea6) will decrease coverage by 0.06%.
The diff coverage is 86.66%.

❗ Current head 94cf8fd differs from pull request most recent head 7d72331. Consider uploading reports for the commit 7d72331 to get more accurate results

@@            Coverage Diff             @@
##           master     #382      +/-   ##
==========================================
- Coverage   88.42%   88.35%   -0.07%     
==========================================
  Files          16       16              
  Lines        1564     1572       +8     
==========================================
+ Hits         1383     1389       +6     
- Misses        181      183       +2     

Impacted Files	Coverage Δ
libtmux/window.py	84.24% <66.66%> (-0.52%)	⬇️
libtmux/test.py	54.34% <90.00%> (+2.58%)	⬆️
libtmux/server.py	79.31% <100.00%> (ø)
libtmux/session.py	81.43% <100.00%> (ø)

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