Update deprecated function imports

pykat/math/zernike.py

 import numpy as np
-from scipy.misc import factorial as fac
+from scipy.special import factorial as fac
 from six.moves import xrange
 import math
 

pykat/optics/knm.py

@@ -8,7 +8,7 @@ from scipy.integrate import dblquad
 from pykat.optics.romhom import ROMWeights
 from math import factorial
 from pykat.math.hermite import hermite
-from scipy.misc import comb
+from scipy.special import comb
 from scipy.integrate import newton_cotes
 from pykat.math import newton_weights