Version bump to 0.3.0 for dc opf

[SanjayJohnson02]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.28%. Comparing base (1b3b7f7) to head (1e29665).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #40   +/-   ##
=======================================
  Coverage   89.28%   89.28%           
=======================================
  Files           9        9           
  Lines        1316     1316           
=======================================
  Hits         1175     1175           
  Misses        141      141           

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[SanjayJohnson02]

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