Fix current_week() for new Yahoo layout

[amarvin]

Closes #91

[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 70.00%. Comparing base (d927e74) to head (76d475a).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
ffbot/scraper.py	25.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #96      +/-   ##
==========================================
- Coverage   70.11%   70.00%   -0.12%     
==========================================
  Files           5        5              
  Lines         348      350       +2     
==========================================
+ Hits          244      245       +1     
- Misses        104      105       +1     

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