add a warning if objects are finalized without being destroyed

[KristofferC]

No description provided.

[codecov]

Codecov Report

Merging #12 (a3dc4ac) into master (cccd36a) will increase coverage by 1.49%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #12      +/-   ##
==========================================
+ Coverage   93.53%   95.03%   +1.49%     
==========================================
  Files           9        9              
  Lines         294      302       +8     
==========================================
+ Hits          275      287      +12     
+ Misses         19       15       -4     

Impacted Files	Coverage Δ
src/AMGX.jl	93.75% <100.00%> (+11.39%)	⬆️
src/Config.jl	100.00% <100.00%> (ø)
src/Matrix.jl	93.50% <100.00%> (+0.17%)	⬆️
src/Resources.jl	100.00% <100.00%> (ø)
src/Solver.jl	97.87% <100.00%> (+0.09%)	⬆️
src/Vector.jl	91.04% <100.00%> (+0.27%)	⬆️

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