Implement Winogrande evaluation

[jon-tow]

Reference Issue: #13

[codecov]

Codecov Report

Merging #123 (2ba0e70) into master (e12d007) will increase coverage by 2.02%.
The diff coverage is 79.31%.

@@            Coverage Diff             @@
##           master     #123      +/-   ##
==========================================
+ Coverage   59.30%   61.33%   +2.02%     
==========================================
  Files          31       31              
  Lines        1848     1857       +9     
==========================================
+ Hits         1096     1139      +43     
+ Misses        752      718      -34     

Impacted Files	Coverage Δ
lm_eval/tasks/__init__.py	92.30% <ø> (ø)
lm_eval/tasks/wsc273.py	74.60% <74.60%> (+32.29%)	⬆️
lm_eval/tasks/winogrande.py	92.85% <91.66%> (+45.12%)	⬆️

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