Add support for JuMP 1.0

[odow]

Part of jump-dev/JuMP.jl#2564

[codecov]

Codecov Report

Merging #38 (95a9f9e) into master (089a2b6) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #38   +/-   ##
=======================================
  Coverage   66.31%   66.31%           
=======================================
  Files          22       22           
  Lines        1404     1404           
=======================================
  Hits          931      931           
  Misses        473      473           

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