Add covimerage-run console script

[blueyed]

This is required/useful for when a single command is required to wrap
Vim, e.g. with vim-thesis.

cf. local stashes

[codecov]

Codecov Report

Merging #47 into master will increase coverage by 1.39%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #47      +/-   ##
==========================================
+ Coverage   95.99%   97.38%   +1.39%     
==========================================
  Files          15       15              
  Lines        1646     1529     -117     
  Branches      176      165      -11     
==========================================
- Hits         1580     1489      -91     
+ Misses         49       27      -22     
+ Partials       17       13       -4

Flag	Coverage Δ
#click6	?
#py27	97.12% <100%> (+1.61%)	⬆️
#py34	95.74% <100%> (+1.52%)	⬆️
#py35	96.59% <100%> (+1.58%)	⬆️
#py36	96.59% <100%> (+1.58%)	⬆️
#py37	?

Impacted Files	Coverage Δ
tests/test_cli.py	100% <100%> (ø)	⬆️
covimerage/cli.py	94.48% <100%> (+0.24%)	⬆️
tests/test_logging.py	100% <0%> (ø)	⬆️
tests/test_main.py	100% <0%> (+0.4%)	⬆️
covimerage/__init__.py	91.5% <0%> (+1.01%)	⬆️
covimerage/coveragepy.py	98.19% <0%> (+6.19%)	⬆️
tests/test_coveragepy.py	100% <0%> (+6.32%)	⬆️

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