Repairs request mechanism for non-alphanum tickers

[addisonlynch]

Fixes #38.

[codecov]

Codecov Report

Merging #43 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #43      +/-   ##
==========================================
- Coverage   96.34%   96.33%   -0.01%     
==========================================
  Files          13       13              
  Lines        1476     1475       -1     
==========================================
- Hits         1422     1421       -1     
  Misses         54       54

Impacted Files	Coverage Δ
iexfinance/base.py	93.93% <100%> (-0.18%)	⬇️

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