Fix GRBgetstrparam

[odow]

Closes #442

[codecov]

Codecov Report

Merging #453 (98eafbf) into master (e7c010e) will increase coverage by 0.26%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #453      +/-   ##
==========================================
+ Coverage   56.07%   56.34%   +0.26%     
==========================================
  Files           9        9              
  Lines        3916     3917       +1     
==========================================
+ Hits         2196     2207      +11     
+ Misses       1720     1710      -10     

Impacted Files	Coverage Δ
src/MOI_wrapper/MOI_wrapper.jl	88.80% <100.00%> (+0.30%)	⬆️
src/gen95/libgrb_api.jl	26.35% <0.00%> (+0.83%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update e7c010e...98eafbf. Read the comment docs.