Fix sklearn.model_selection. Remove output

ml1/plotml.py

@@ -1,7 +1,7 @@
 import numpy as np
 import matplotlib.pyplot as plt
 from matplotlib.colors import ListedColormap
-from sklearn.cross_validation import train_test_split
+from sklearn.model_selection import train_test_split
 from sklearn.preprocessing import StandardScaler
 from sklearn.datasets import make_moons, make_circles, make_classification
 from sklearn.neighbors import KNeighborsClassifier