CI: doctesting uses coverage, fiy py37 on AppVeyor

[blueyed]

No description provided.

[codecov]

Codecov Report

Merging #4374 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4374   +/-   ##
=======================================
  Coverage   95.84%   95.84%           
=======================================
  Files         111      111           
  Lines       24928    24928           
  Branches     2431     2431           
=======================================
  Hits        23892    23892           
  Misses        738      738           
  Partials      298      298

Flag	Coverage Δ
#docs	29.66% <ø> (+0.81%)	⬆️
#doctesting	29.66% <ø> (+0.81%)	⬆️
#linting	29.66% <ø> (+0.81%)	⬆️
#linux	95.67% <ø> (+0.04%)	⬆️
#nobyte	92.33% <ø> (ø)	⬆️
#numpy	92.95% <ø> (ø)	⬆️
#pexpect	41.59% <ø> (ø)	⬆️
#py27	94.03% <ø> (ø)	⬆️
#py34	92.15% <ø> (+0.06%)	⬆️
#py35	92.16% <ø> (+0.06%)	⬆️
#py36	93.9% <ø> (+0.02%)	⬆️
#py37	92.38% <ø> (+0.23%)	⬆️
#trial	92.95% <ø> (ø)	⬆️
#windows	94.09% <ø> (+0.2%)	⬆️
#xdist	93.73% <ø> (ø)	⬆️

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