added support for wnba basketball

[zwebb2]

Added a new league type that enables support for wnba basketball, including a working PRO_TEAM_MAP for wnba teams in the constants.py file.

[cwendt94]

This is awesome, thanks for adding wnba league!

two small notes

1. can you remove import pdb from the python files
2. would you be able to right a small integration test for this league like basketball. The folder can be wbasketball. You will just need a public league that you can use for testing.

[zwebb2]

I removed the pdb imports as well. Note that this league has only been running for a few days, so the assertions in the tests will fail after today, and need to be updated with correct values after the end of the season.

[cwendt94]

You can comment out the tests that are checking current stats so that they won't fail.

These tests are mainly used to check that you can still load a WNBA league without errors.

I can add some more tests in the future.

[codecov-commenter]

Codecov Report

Merging #332 (8700c8e) into master (29d3467) will decrease coverage by 4.91%.
The diff coverage is 57.54%.

@@            Coverage Diff             @@
##           master     #332      +/-   ##
==========================================
- Coverage   87.82%   82.91%   -4.92%     
==========================================
  Files          47       56       +9     
  Lines        1643     1961     +318     
==========================================
+ Hits         1443     1626     +183     
- Misses        200      335     +135     

Impacted Files	Coverage Δ
espn_api/requests/constant.py	100.00% <ø> (ø)
espn_api/wbasketball/box_score.py	13.79% <13.79%> (ø)
espn_api/wbasketball/activity.py	18.18% <18.18%> (ø)
espn_api/wbasketball/box_player.py	22.22% <22.22%> (ø)
espn_api/wbasketball/league.py	48.80% <48.80%> (ø)
espn_api/wbasketball/matchup.py	86.95% <86.95%> (ø)
espn_api/wbasketball/player.py	91.66% <91.66%> (ø)
espn_api/wbasketball/team.py	97.82% <97.82%> (ø)
espn_api/wbasketball/__init__.py	100.00% <100.00%> (ø)
espn_api/wbasketball/constant.py	100.00% <100.00%> (ø)
... and 1 more

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[cwendt94]

After the first matchup is finished we can add some tests to the different components to get better coverage on this league.