Fix warnings for latest Distances.jl

[juliohm]

┌ Warning: `colwise!(r::AbstractArray, dist::PreMetric, a, b)` is deprecated, use `colwise!(dist, r, a, b)` instead.
│   caller = initseeds!(iseeds::Vector{Int64}, alg::Clustering.KmppAlg, X::LinearAlgebra.Adjoint{Float64, Matrix{Float64}}, metric::Distances.SqEuclidean; rng::Random._GLOBAL_RNG) at seeding.jl:184
└ @ Clustering ~/.julia/packages/Clustering/8WUOQ/src/seeding.jl:184
┌ Warning: `pairwise!(r::AbstractMatrix, dist::PreMetric, a::AbstractMatrix, b::AbstractMatrix; dims::Union{Nothing, Integer} = nothing)` is deprecated, use `pairwise!(dist, r, a, b; dims = dims)` instead.
│   caller = _kmeans!(X::LinearAlgebra.Adjoint{Float64, Matrix{Float64}}, weights::Nothing, centers::Matrix{Float64}, maxiter::Int64, tol::Float64, displevel::Int64, distance::Distances.SqEuclidean, rng::Random._GLOBAL_RNG) at kmeans.jl:172
└ @ Clustering ~/.julia/packages/Clustering/8WUOQ/src/kmeans.jl:172

[alyst]

These warnings should be fixed by #259. I'll tag a new version.