New version: LsqFit v0.16.0

[JuliaRegistrator]

• Registering package: LsqFit
• Repository: https://github.com/JuliaNLSolvers/LsqFit.jl
• Created by: @pkofod
• Version: v0.16.0
• Commit: c7ee68dddaa75f1ed483125f74cfdfcb988c72ee
• Reviewed by: @pkofod
• Reference: JuliaNLSolvers/LsqFit.jl@c7ee68d#commitcomment-182036979
• Description: Simple curve fitting in Julia
• Release notes:

## Breaking changes

- The `autodiff` no longer accepts Symbols but the user should rather use the ADTypes framework to specify an autodiff choice.

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