fix deprecated import of make_blobs in make_forge

Author: amueller

mglearn/datasets.py

@@ -4,7 +4,7 @@
 from scipy import signal
 from sklearn.datasets import load_boston
 from sklearn.preprocessing import MinMaxScaler, PolynomialFeatures
-from .make_blobs import make_blobs
+from sklearn.datasets import make_blobs
 
 DATA_PATH = os.path.join(os.path.dirname(__file__), "..", "data")