Update to MOI v1

[blegat]

Part of jump-dev/JuMP.jl#2564

Closes #3
Closes #4

[codecov]

Codecov Report

Merging #5 (517dc9c) into master (566488a) will decrease coverage by 0.36%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master       #5      +/-   ##
==========================================
- Coverage   91.79%   91.42%   -0.37%     
==========================================
  Files           4        4              
  Lines         195      210      +15     
==========================================
+ Hits          179      192      +13     
- Misses         16       18       +2     

Impacted Files	Coverage Δ
src/utils.jl	86.66% <0.00%> (-13.34%)	⬇️
src/MOI_wrapper.jl	97.41% <0.00%> (+0.38%)	⬆️

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