Update to HiGHS v1.1

[odow]

Closes #65

[codecov]

Codecov Report

Merging #69 (9046538) into master (fe52df1) will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #69      +/-   ##
==========================================
+ Coverage   80.71%   80.79%   +0.07%     
==========================================
  Files           2        2              
  Lines        1084     1088       +4     
==========================================
+ Hits          875      879       +4     
  Misses        209      209              

Impacted Files	Coverage Δ
src/MOI_wrapper.jl	93.72% <100.00%> (+0.02%)	⬆️

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