Rename base_cards to base_set

[evanofslack]

No description provided.

[codecov-commenter]

Codecov Report

Merging #82 (3fb16bb) into master (d174494) will decrease coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #82      +/-   ##
==========================================
- Coverage   97.09%   97.01%   -0.08%     
==========================================
  Files          11       11              
  Lines        1409     1409              
==========================================
- Hits         1368     1367       -1     
- Misses         41       42       +1     

Impacted Files	Coverage Δ
pyminion/expansions/base.py	98.83% <100.00%> (ø)
pyminion/game.py	96.92% <0.00%> (-1.54%)	⬇️
pyminion/players.py	95.81% <0.00%> (+0.46%)	⬆️

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