Setup Compat in Project.toml

[ccoffrin]

Prep for package release.

[codecov-commenter]

Codecov Report

Merging #2 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master       #2   +/-   ##
=======================================
  Coverage   92.16%   92.16%           
=======================================
  Files          18       18           
  Lines        2336     2336           
=======================================
  Hits         2153     2153           
  Misses        183      183           

Impacted Files	Coverage Δ
src/MadNLP.jl	100.00% <100.00%> (ø)
src/interiorpointsolver.jl	95.97% <100.00%> (ø)

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[sshin23]

Thanks, @ccoffrin. Merging this PR.