Add method to comply with JuMP's is_parameter

[joaquimg]

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[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 95.15%. Comparing base (bc64222) to head (8f143b6).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/MOI_wrapper.jl	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #160      +/-   ##
==========================================
- Coverage   95.22%   95.15%   -0.08%     
==========================================
  Files           5        5              
  Lines        1026     1031       +5     
==========================================
+ Hits          977      981       +4     
- Misses         49       50       +1     

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