Fix Raw Optimizer Attribute Access

[pedromxavier]

This PR aims to close #65.

[codecov-commenter]

Codecov Report

Base: 61.16% // Head: 70.56% // Increases project coverage by +9.40% 🎉

Coverage data is based on head (2e840d3) compared to base (787aa28).
Patch coverage: 71.31% of modified lines in pull request are covered.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #66      +/-   ##
==========================================
+ Coverage   61.16%   70.56%   +9.40%     
==========================================
  Files          21       24       +3     
  Lines        1146     1247     +101     
==========================================
+ Hits          701      880     +179     
+ Misses        445      367      -78     

Impacted Files	Coverage Δ
src/compiler/architectures.jl	50.00% <0.00%> (ø)
src/lib/pbo/print.jl	0.00% <0.00%> (ø)
src/model/prequbo.jl	0.00% <ø> (ø)
src/attributes/model.jl	25.00% <25.00%> (ø)
src/lib/pbo/wrapper.jl	8.69% <33.33%> (ø)
src/attributes/solver.jl	50.00% <50.00%> (ø)
src/lib/pbo/tools.jl	66.66% <58.33%> (+3.40%)	⬆️
src/attributes/compiler.jl	59.83% <59.83%> (ø)
src/lib/pbo/quadratization.jl	64.00% <64.28%> (-3.80%)	⬇️
src/model/wrapper.jl	77.77% <72.00%> (+5.31%)	⬆️
... and 14 more

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