v0.6.1

ADNLPModels v0.6.1

Diff since v0.6.0

Merged pull requests:

• Update files related to sparse Jacobian (#125) (@amontoison)
• Sparse hessian with Symbolics.jl (#126) (@amontoison)
• Add NLS in-place constructors with no nonlinear constraints (#128) (@tmigot)
• Update SparseADHessian structure for an optimized hess_coord! (#130) (@amontoison)
• Fix API for sparse hessian (#131) (@tmigot)
• Version 0.6.1 (#132) (@tmigot)