upgrade flake8-docstrings to 1.1.0 and fix coverage to pass travis

[graingert]

No description provided.

[codecov-io]

Codecov Report

Merging #46 into master will decrease coverage by 0.42%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #46      +/-   ##
==========================================
- Coverage     100%   99.57%   -0.43%     
==========================================
  Files           8        8              
  Lines         466      466              
  Branches       76       76              
==========================================
- Hits          466      464       -2     
- Misses          0        1       +1     
- Partials        0        1       +1

Impacted Files	Coverage Δ
terminaltables/terminal_io.py	96% <0%> (-4%)	⬇️

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