Output `data` of `slidingwindow` does not support `getobs(data, idx)` when `idx` is a vector of integers

[ablaom]

x = [1 2 3 4 5;
     6 7 8 9 10]
data = MLUtils.slidingwindow(x, size=2)

# works as adverised:
MLUtils.getobs(data, 1)
# 2×2 Matrix{Int64}:
#  1  2
#  6  7

MLUtils.getobs(data, 1:2)
# ERROR: MethodError: no method matching getindex(::MLUtils.SlidingWindow{Matrix{Int64}}, ::UnitRange{Int64})
# The function `getindex` exists, but no method is defined for this combination of argument types.

The code only implements a single integer, as far as I could tell.

The doc-string suggests the above ought to have worked: "When indexing the data is accessed as getobs(data, idxs), with idxs an appropriate range of indexes."