Update ScikitLearn.jl

[OkonSamuel]

Hi, This PR fixes a bug in interface code to ScikitLearn.jl. see issue #149 for context. An alternative solution would be to make the definition of fit! less restrictive as

function fit!(gp::GPE, x::AbstractMatrix, y::AbstractVector)
    length(y) == size(x,2) || throw(ArgumentError("Input and output observations must have consistent dimensions."))
    gp.x = x
    gp.y = y
    gp.data = KernelData(gp.kernel, x, x, gp.covstrat)
    gp.cK = alloc_cK(gp.covstrat, length(y))
    gp.dim, gp.nobs = size(x)
    initialise_target!(gp)
end

[coveralls]

Pull Request Test Coverage Report for Build 430

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 74.822%

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Totals
Change from base Build 422:	0.0%
Covered Lines:	1468
Relevant Lines:	1962

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💛 - Coveralls

[chris-nemeth]

Thanks for the PR!

[OkonSamuel]

@chris-nemeth. Thanks Could you please tag a new release

[chris-nemeth]

Sure. Will do.