optim, minor fix, update

[PharmCat]

No description provided.

[codecov]

Codecov Report

Base: 86.77% // Head: 87.08% // Increases project coverage by +0.31% 🎉

Coverage data is based on head (ab9fcb0) compared to base (f1d3f27).
Patch coverage: 99.14% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #32      +/-   ##
==========================================
+ Coverage   86.77%   87.08%   +0.31%     
==========================================
  Files          24       24              
  Lines        2850     2858       +8     
==========================================
+ Hits         2473     2489      +16     
+ Misses        377      369       -8     

Impacted Files	Coverage Δ
src/Metida.jl	100.00% <ø> (ø)
src/lmm.jl	85.51% <0.00%> (ø)
src/gmat.jl	84.06% <100.00%> (+0.45%)	⬆️
src/linearalgebra.jl	91.26% <100.00%> (+6.79%)	⬆️
src/rmat.jl	87.91% <100.00%> (+0.15%)	⬆️
src/sweep.jl	88.88% <100.00%> (+1.85%)	⬆️
src/utils.jl	86.84% <100.00%> (ø)
src/varstruct.jl	100.00% <100.00%> (ø)

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