Updated to import sklearn.model_selection

Updated to import sklearn.model_selection rather than sklearn.cross_validation to try to fix issue aigamedev#240

sknn/mlp.py

@@ -19,7 +19,7 @@
 import sklearn.base
 import sklearn.pipeline
 import sklearn.preprocessing
-import sklearn.cross_validation
+import sklearn.model_selection
 
 from .nn import NeuralNetwork, Layer, Convolution, Native, ansi
 from . import backend