Added state code to the address object

[korbenclario]

Hi

I want to use your library, but need State Code in the response. Please, check my solution, I've added state code in all services which provide state code.

I can make additional updates if something wrong.

Otherwise, I'll need to create a map where I'll lookup long names to short, which looks strange for me as logically library can provide these already.

Regards,
Aleksandr

[codecov]

Codecov Report

Merging #64 (a4cc14b) into master (c1d893b) will increase coverage by 0.11%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #64      +/-   ##
==========================================
+ Coverage   79.48%   79.60%   +0.11%     
==========================================
  Files          22       22              
  Lines         702      706       +4     
==========================================
+ Hits          558      562       +4     
  Misses         97       97              
  Partials       47       47              

Impacted Files	Coverage Δ
geocod/geocoder.go	82.75% <100.00%> (+0.61%)	⬆️
google/geocoder.go	71.69% <100.00%> (+0.54%)	⬆️
mapbox/geocoder.go	81.57% <100.00%> (+0.49%)	⬆️
mapzen/geocoder.go	75.86% <100.00%> (+0.86%)	⬆️

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[codingsince1985]

looks good, hope it suits your case now @korbenclario

[korbenclario]

@codingsince1985 perfectly, thank you!