change comb import to new non deprecated version

tick/preprocessing/longitudinal_features_product.py

@@ -4,7 +4,7 @@
 import scipy.sparse as sps
 from itertools import combinations
 from copy import deepcopy
-from scipy.misc import comb
+from scipy.special import comb
 from sklearn.externals.joblib import Parallel, delayed
 from tick.preprocessing.base import LongitudinalPreprocessor
 from .build.preprocessing import SparseLongitudinalFeaturesProduct