fix: missing warning module import

[kasteph]

No description provided.

[codecov]

Codecov Report

Patch coverage: 50.00% and project coverage change: +4.28% 🎉

Comparison is base (17da8df) 59.25% compared to head (fdc1746) 63.53%.
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #25      +/-   ##
==========================================
+ Coverage   59.25%   63.53%   +4.28%     
==========================================
  Files          34       34              
  Lines        1875     1876       +1     
==========================================
+ Hits         1111     1192      +81     
+ Misses        764      684      -80     

Files Changed	Coverage Δ
pragma/core/contract.py	60.29% <50.00%> (+40.89%)	⬆️

... and 17 files with indirect coverage changes

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