getiterator to iter (#501)

Author: brandonchinn178

markdown/extensions/attr_list.py

@@ -83,7 +83,7 @@ class AttrListTreeprocessor(Treeprocessor):
                          r'\:\-\.0-9\u00b7\u0300-\u036f\u203f-\u2040]+')
 
     def run(self, doc):
-        for elem in doc.getiterator():
+        for elem in doc.iter():
             if isBlockLevel(elem.tag):
                 # Block level: check for attrs on last line of text
                 RE = self.BLOCK_RE