fix import

markdown2html.py

@@ -12,6 +12,7 @@ import concurrent.futures
 import urllib.request
 import base64
 from .lib.bs4 import BeautifulSoup as bs4
+from .lib.bs4.element import Comment
 
 from functools import partial
 
@@ -61,7 +62,7 @@ def markdown2html(markdown, basepath, re_render, resources, viewport_width, font
 
     # remove comments, because they pollute the console with error messages
     for comment_element in soup.find_all(
-        text=lambda text: isinstance(text, bs4.Comment)
+        text=lambda text: isinstance(text, Comment)
     ):
         comment_element.extract()