Add missing positions, new patch version, update tests

[jaebradley]

Add the "F", "G-F", "F-C", "G" positions.

Hopefully, resolves #54

[codecov]

Codecov Report

Merging #55 into master will increase coverage by 0.1%.
The diff coverage is 100%.

@@           Coverage Diff            @@
##           master     #55     +/-   ##
========================================
+ Coverage   93.69%   93.8%   +0.1%     
========================================
  Files          10      10             
  Lines         238     242      +4     
  Branches       27      27             
========================================
+ Hits          223     227      +4     
  Misses         11      11             
  Partials        4       4

Impacted Files	Coverage Δ
setup.py	0% <ø> (ø)	⬆️
basketball_reference_web_scraper/data.py	100% <100%> (ø)	⬆️

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