Update to PowerModels v0.18

[ccoffrin]

No description provided.

[codecov]

Codecov Report

Merging #79 (5ba2d74) into master (f1fbedd) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #79   +/-   ##
=======================================
  Coverage   80.35%   80.35%           
=======================================
  Files          22       22           
  Lines        1634     1634           
=======================================
  Hits         1313     1313           
  Misses        321      321           

Impacted Files	Coverage Δ
src/PowerModelsAnnex.jl	100.00% <ø> (ø)
src/model/ac-opf.jl	70.45% <ø> (ø)
src/model/dc-opf.jl	60.86% <ø> (ø)
src/model/opf.jl	100.00% <100.00%> (ø)
src/model/pf.jl	98.63% <100.00%> (ø)
src/pglib/api.jl	87.05% <100.00%> (ø)
src/pglib/shared.jl	100.00% <100.00%> (ø)
src/piecewise-linear/delta.jl	96.07% <100.00%> (ø)
src/piecewise-linear/lambda.jl	97.67% <100.00%> (ø)
src/piecewise-linear/phi.jl	92.98% <100.00%> (ø)
... and 1 more

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