Merge pull request matplotlib#2100 from glyg/master

Remove DeprecationWarning in simple_linear_interpolation

Author: mdboom

lib/matplotlib/cbook.py

@@ -1511,8 +1511,8 @@ def simple_linear_interpolation(a, steps):
     a0 = a[0:-1]
     a1 = a[1:]
     delta = ((a1 - a0) / steps)
-
-    for i in range(1, int(steps)):
+    steps = int(steps)
+    for i in range(1, steps):
         result[i::steps] = delta * i + a0
     result[steps::steps] = a1