NelderMead trace contains only final result

[tuncbkose]

Same issue as #418 except concerning metadata added in #719.

[pkofod]

Can you show me an example and can I ask what version of Optim?

[tuncbkose]

Ran on Optim v1.9.4

using Optim

f(x) = (x[1]^2 + x[2] - 11)^2 + (x[1] + x[2]^2 - 7)^2

x0 = [0.0, 0.0]
opt = Optim.Options(store_trace = true,
                    trace_simplex = true)
res = optimize(f, x0, NelderMead(), opt)
tr = Optim.simplex_trace(res)

[pkofod]

Thanks, put up a PR for it