Use FiniteDiff over Calculus and DiffEqDiffTools.

[pkofod]

No description provided.

[codecov]

Codecov Report

Merging #111 into master will increase coverage by 0.33%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #111      +/-   ##
==========================================
+ Coverage   93.62%   93.96%   +0.33%     
==========================================
  Files          10       10              
  Lines         502      497       -5     
==========================================
- Hits          470      467       -3     
+ Misses         32       30       -2

Impacted Files	Coverage Δ
src/NLSolversBase.jl	80% <ø> (ø)	⬆️
src/objective_types/twicedifferentiable.jl	98.36% <100%> (ø)	⬆️
src/objective_types/oncedifferentiable.jl	86.58% <100%> (ø)	⬆️
src/objective_types/constraints.jl	95.61% <100%> (-0.04%)	⬇️
src/interface.jl	94.06% <0%> (+1.44%)	⬆️

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[ChrisRackauckas]

🎉