Fix #4100: Remove debug print from autodoc extension

CHANGES

@@ -17,6 +17,7 @@ Bugs fixed
 ----------
 
 * #4085: Failed PDF build from image in parsed-literal using ``:align:`` option
+* #4100: Remove debug print from autodoc extension
 
 Testing
 --------

sphinx/ext/autodoc.py

@@ -971,7 +971,6 @@ class Documenter(object):
                     # keep documented attributes
                     keep = True
                 isattr = True
-                print(membername, keep)
             elif want_all and membername.startswith('_'):
                 # ignore members whose name starts with _ by default
                 keep = self.options.private_members and \