changes from flynt

[abyz0123]

was pretty painless, the tests ran successfully.

[cosmicBboy]

looks good @ktroutman, thanks!

looks like there are some black formatting errors: https://travis-ci.org/github/pandera-dev/pandera/jobs/744748032#L634-L637

are you using balck auto-formatting on your IDE? If so it'll have to match the version and arguments in the precommit yaml file... otherwise I'm not sure why we're seeing this error.

[abyz0123]

I do have the black hooks, but i put the flynt hooks after black so the flynt changes weren't conform to black. I changed the order of the hooks so that flynt comes before black.

[codecov-io]

Codecov Report

Merging #325 (a54df7d) into master (0cb9869) will increase coverage by 0.14%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #325      +/-   ##
==========================================
+ Coverage   98.64%   98.79%   +0.14%     
==========================================
  Files          18       18              
  Lines        1702     1738      +36     
==========================================
+ Hits         1679     1717      +38     
+ Misses         23       21       -2     

Impacted Files	Coverage Δ
pandera/checks.py	98.42% <ø> (ø)
pandera/decorators.py	100.00% <ø> (ø)
pandera/dtypes.py	100.00% <ø> (+2.29%)	⬆️
pandera/error_formatters.py	100.00% <ø> (ø)
pandera/hypotheses.py	92.72% <ø> (ø)
pandera/schema_statistics.py	100.00% <ø> (ø)
pandera/errors.py	100.00% <100.00%> (ø)
pandera/io.py	97.82% <100.00%> (ø)
pandera/schema_components.py	98.42% <100.00%> (+0.02%)	⬆️
pandera/schemas.py	98.12% <100.00%> (+0.14%)	⬆️
... and 5 more

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