Move clear_border to segmentation package

skimage/segmentation/__init__.py

@@ -3,3 +3,4 @@ from ._felzenszwalb import felzenszwalb
 from ._slic import slic
 from ._quickshift import quickshift
 from .boundaries import find_boundaries, visualize_boundaries
+from ._clear_border import clear_border

skimage/segmentation/tests/test_clear_border.py

@@ -1,6 +1,6 @@
 import numpy as np
 from numpy.testing import assert_array_equal, assert_equal
-from skimage.morphology import clear_border
+from skimage.segmentation import clear_border
 
 
 def test_clear_border():