Add singe variable less than equal to

[matbesancon]

No description provided.

[matbesancon]

MOI 0.9.20 added a new quadratic test that needed to be ignored

[codecov]

Codecov Report

Merging #76 (6e7a9a9) into master (f2be16c) will increase coverage by 0.81%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #76      +/-   ##
==========================================
+ Coverage   85.23%   86.05%   +0.81%     
==========================================
  Files           4        4              
  Lines         359      380      +21     
==========================================
+ Hits          306      327      +21     
  Misses         53       53              

Impacted Files	Coverage Δ
src/MOI_wrapper.jl	85.71% <100.00%> (+0.16%)	⬆️
src/utils.jl	80.48% <100.00%> (+5.48%)	⬆️

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