Add missing test dependencies to Project.toml

[ararslan]

Noticed while checking for package testing regressions for the upcoming Julia 1.2 release

[codecov]

Codecov Report

Merging #108 into master will increase coverage by 2.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #108      +/-   ##
==========================================
+ Coverage   91.42%   93.46%   +2.04%     
==========================================
  Files          10       10              
  Lines         408      490      +82     
==========================================
+ Hits          373      458      +85     
+ Misses         35       32       -3

Impacted Files	Coverage Δ
src/objective_types/oncedifferentiable.jl	86.58% <0%> (-2.48%)	⬇️
src/objective_types/twicedifferentiablehv.jl	100% <0%> (ø)	⬆️
src/objective_types/incomplete.jl	97.67% <0%> (+0.05%)	⬆️
src/objective_types/twicedifferentiable.jl	98.3% <0%> (+0.15%)	⬆️
src/NLSolversBase.jl	80% <0%> (+2.22%)	⬆️
src/objective_types/constraints.jl	95.65% <0%> (+2.24%)	⬆️
src/objective_types/nondifferentiable.jl	66.66% <0%> (+4.16%)	⬆️
src/interface.jl	92.62% <0%> (+8.75%)	⬆️

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[tlienart]

bump

[pkofod]

thanks