simplify type-matching logic in SeriesSchemaBase

[cosmicBboy]

No description provided.

[codecov-io]

Codecov Report

Merging #194 into master will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #194      +/-   ##
==========================================
- Coverage   96.21%   96.19%   -0.03%     
==========================================
  Files           9        9              
  Lines         714      709       -5     
==========================================
- Hits          687      682       -5     
  Misses         27       27              

Impacted Files	Coverage Δ
pandera/schemas.py	96.68% <100.00%> (-0.07%)	⬇️

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