Basic doctest

[tony]

Fixes #388

[codecov]

Codecov Report

Merging #394 (83e0e4b) into master (e3895d0) will increase coverage by 0.22%.
The diff coverage is 89.39%.

@@            Coverage Diff             @@
##           master     #394      +/-   ##
==========================================
+ Coverage   88.32%   88.54%   +0.22%     
==========================================
  Files          16       18       +2     
  Lines        1747     1851     +104     
==========================================
+ Hits         1543     1639      +96     
- Misses        204      212       +8     

Impacted Files	Coverage Δ
libtmux/pane.py	78.26% <ø> (+1.08%)	⬆️
libtmux/server.py	80.66% <ø> (ø)
libtmux/session.py	82.48% <ø> (+1.12%)	⬆️
libtmux/window.py	84.88% <ø> (ø)
libtmux/test.py	79.38% <50.00%> (+25.21%)	⬆️
libtmux/conftest.py	90.16% <90.16%> (ø)
docs/conf.py	61.70% <100.00%> (ø)
tests/conftest.py	100.00% <100.00%> (+11.32%)	⬆️
libtmux/common.py	86.93% <0.00%> (+0.40%)	⬆️
... and 3 more

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