Update to JuMP v0.22

[pulsipher]

This updates to the new JuMP eco-system.

[codecov]

Codecov Report

Merging #177 (23a2852) into master (fcb0af2) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #177      +/-   ##
==========================================
- Coverage   99.81%   99.81%   -0.01%     
==========================================
  Files          33       33              
  Lines        7129     7068      -61     
==========================================
- Hits         7116     7055      -61     
  Misses         13       13              

Impacted Files	Coverage Δ
src/datatypes.jl	100.00% <ø> (ø)
src/results.jl	100.00% <ø> (ø)
src/TranscriptionOpt/model.jl	100.00% <100.00%> (ø)
src/TranscriptionOpt/transcribe.jl	99.73% <100.00%> (ø)
src/macros.jl	100.00% <100.00%> (ø)
src/nlp.jl	100.00% <100.00%> (ø)
src/optimize.jl	100.00% <100.00%> (ø)
src/utilities.jl	100.00% <100.00%> (ø)

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[odow]

Phew! Some pretty minor changes then.