Interface error for VEGAS from [email protected]

[lxvm]

The following mwe (taken from #46)

using Integrals, ForwardDiff, FiniteDiff, Zygote, Cuba

f(x,p) = sum(sin.(x .* p))
lb = ones(2)
ub = 3ones(2)
p = [1.5,2.0]
prob = IntegralProblem(f,lb,ub,p)
solve(prob,VEGAS(),reltol=1e-6,abstol=1e-6,maxiters =1000)[1]

errors with

ERROR: MethodError: no method matching iterate(::MonteCarloIntegration.VEGASResult{Float64, Float64, Float64, Matrix{Float64}, Matrix{Float64}})

however it works for [email protected].
We probably have to fix/revert commit 68ae9d6 from #189.
The tests didn't catch this because they opt out of VEGAS, which probably needs to change.

We could also look into replacing the package with the more capable https://github.com/numericalEFT/MCIntegration.jl.