Updates to PolyJuMP updates

[blegat]

Updates for jump-dev/PolyJuMP.jl#21

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (move-to-PolyJuMP@ac12f55). Click here to learn what that means.
The diff coverage is 96.29%.

@@                 Coverage Diff                 @@
##             move-to-PolyJuMP      #39   +/-   ##
===================================================
  Coverage                    ?   87.64%           
===================================================
  Files                       ?        6           
  Lines                       ?      178           
  Branches                    ?        0           
===================================================
  Hits                        ?      156           
  Misses                      ?       22           
  Partials                    ?        0

Impacted Files	Coverage Δ
src/SumOfSquares.jl	100% <100%> (ø)
src/constraint.jl	95.23% <100%> (ø)
src/variable.jl	87.87% <100%> (ø)
src/matpoly.jl	92% <87.5%> (ø)

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