GMM out of date on 05.12-Gaussian-Mixtures.ipynb

[julia-codes]

Sklearn.mixture GMM is out of date per this Stack Overflow

from sklearn.mixture import GMM
gmm = GMM(n_components=4).fit(X)
labels = gmm.predict(X)

results in an error of
ImportError: cannot import name 'GMM'

This needs to use mixture.GaussianMixture instead
(I'm working on a forked fix)

[julia-codes]

Exiting Pull request Gaussianmixture #288