Merge pull request matplotlib#14901 from bingyao/fix_tests_with_numpy_1_17

Fix:  numpy 1.17.0 breaks test_colors.

closes matplotlib#14900

Author: tacaswell

lib/matplotlib/colors.py

@@ -1724,7 +1724,7 @@ def shade_normals(self, normals, fraction=1.):
             # visually appears better than a "hard" clip.
             intensity -= imin
             intensity /= (imax - imin)
-        intensity = np.clip(intensity, 0, 1, intensity)
+        intensity = np.clip(intensity, 0, 1)
 
         return intensity