Basketball Add Moved as an Optional Output of Activity

[JohnDiebold]

This adds the moved activity in basketball (player moved to a different fantasy roster slot). It is an optional argument with default value of False so that existing usage is not affected.

[JohnDiebold]

@cwendt94 I've tested this with a couple of my leagues. If there's other testing that needs to be done or things needing changing let me know.

Just to add some context for why I would find this useful. I have a MySQL database for each fantasy teams roster on each day of the season. I use that to sum each teams projected points for the week (this is a points league). I'd like to store the time of the last activity and compare it to when the table was last updated to know if I need to update the table because someone moved a player from or to the bench. Right now the activities only returns add/drops, not moves.

[codecov]

Codecov Report

Attention: Patch coverage is 15.78947% with 16 lines in your changes missing coverage. Please review.

Project coverage is 83.98%. Comparing base (8e131e7) to head (993d24b).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
espn_api/basketball/activity.py	12.50%	14 Missing ⚠️
espn_api/basketball/league.py	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #581      +/-   ##
==========================================
- Coverage   84.39%   83.98%   -0.42%     
==========================================
  Files          60       60              
  Lines        2243     2254      +11     
==========================================
  Hits         1893     1893              
- Misses        350      361      +11     

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[cwendt94]

Just a couple comments and small suggestions

[JohnDiebold]

Changes from all suggestions made. Thanks for the review!