gradient and hessian are exported

[dgleich]

Just a quick note that gradient and hessian are exported. This contradicts the news that says they are no longer exported.

Interpolations.jl/src/hermite/cubic.jl

Line 154 in 4ad83f8

export gradient

[mkitti]

Thanks. This is a good point. It looks like these functions were unexported six years ago, but then reexported about 2 years ago. They probably should not be exported.