Minor: run: required arg, pytest config

[blueyed]

pytest: use -vv by default (a separate option would be better likely (pytest-dev/pytest#3962))

[codecov]

Codecov Report

Merging #53 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #53      +/-   ##
==========================================
+ Coverage   97.37%   97.38%   +<.01%     
==========================================
  Files          15       15              
  Lines        1563     1567       +4     
  Branches      166      166              
==========================================
+ Hits         1522     1526       +4     
  Misses         28       28              
  Partials       13       13

Flag	Coverage Δ
#py27	97.12% <100%> (ø)	⬆️
#py34	95.78% <100%> (+0.01%)	⬆️
#py35	96.61% <100%> (ø)	⬆️
#py36	96.61% <100%> (ø)	⬆️
#py37	96.61% <100%> (?)

Impacted Files	Coverage Δ
tests/test_cli.py	100% <100%> (ø)	⬆️
covimerage/cli.py	94.24% <100%> (ø)	⬆️

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