Merge pull request #1206 from tonysyu/fix/canny-deprecation

Fix deprecation of canny function

skimage/filter/__init__.py

@@ -19,7 +19,7 @@ denoise_tv_chambolle = deprecated('skimage.restoration.denoise_tv_chambolle')\
                         (restoration.denoise_tv_chambolle)
 
 # Backward compatibility v<0.11
-@deprecated
+@deprecated('skimage.feature.canny')
 def canny(*args, **kwargs):
     # Hack to avoid circular import
     from skimage.feature._canny import canny as canny_