Update to MOI v0.7

[blegat]

No description provided.

[coveralls]

Coverage decreased (-7.5%) to 91.283% when pulling 79e4f02 on bl/moi7 into 2f28e29 on master.

[codecov-io]

Codecov Report

Merging #22 into master will increase coverage by 0.41%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #22      +/-   ##
==========================================
+ Coverage    90.9%   91.32%   +0.41%     
==========================================
  Files           6        6              
  Lines         396      415      +19     
==========================================
+ Hits          360      379      +19     
  Misses         36       36

Impacted Files	Coverage Δ
src/SemidefiniteOptInterface.jl	90.82% <100%> (+0.25%)	⬆️
src/mock.jl	79.09% <100%> (+3.55%)	⬆️

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