Require JuMP 0.22.2 for max/min fix

[pulsipher]

This updates to the new version of JuMP. Following #195.

[codecov]

Codecov Report

Merging #200 (3b93a76) into master (89cd8d4) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #200   +/-   ##
=======================================
  Coverage   99.81%   99.81%           
=======================================
  Files          33       33           
  Lines        7072     7072           
=======================================
  Hits         7059     7059           
  Misses         13       13           

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