Update to MOI 0.6.

[tkoolen]

No description provided.

[codecov]

Codecov Report

Merging #91 into master will increase coverage by 0.04%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #91      +/-   ##
=========================================
+ Coverage   97.85%   97.9%   +0.04%     
=========================================
  Files           9       9              
  Lines         514     525      +11     
=========================================
+ Hits          503     514      +11     
  Misses         11      11

Impacted Files	Coverage Δ
src/moi_interop.jl	98.24% <100%> (ø)	⬆️
src/model.jl	96.2% <100%> (+0.09%)	⬆️
src/lazyexpression.jl	100% <0%> (ø)	⬆️
src/debug.jl	100% <0%> (ø)	⬆️

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