Fix dualize for arbitrary coefficient

[blegat]

Closes #225

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.08%. Comparing base (7e0d6cb) to head (38dd7bd).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #226   +/-   ##
=======================================
  Coverage   95.08%   95.08%           
=======================================
  Files          16       16           
  Lines         834      834           
=======================================
  Hits          793      793           
  Misses         41       41           

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[jeremypparker]

Thanks for the quick fix - much appreciated

[blegat]

It was quicker than jump-dev/SumOfSquares.jl#356 😁