Make WeasyPrint work w/ html5lib 0.9999999 (7 9s)

We need this older version of html5lib because bleach doesn’t yet support versions greater than 0.9999999 (7 9s). It will at some point in the future: mozilla/bleach#229

Weasyprint doesn’t support versions of html5lib lower than 0.999999999 (9 9s) and isn’t going to: Kozea#353 (comment)

So this commit patches Weasyprint to use the older version.

weasyprint/__init__.py

@@ -89,8 +89,7 @@ def __init__(self, guess=None, filename=None, url=None, file_obj=None,
                         namespaceHTMLElements=False)
                 else:
                     result = html5lib.parse(
-                        source, treebuilder='lxml', override_encoding=encoding,
-                        transport_encoding=protocol_encoding,
+                        str(source), treebuilder='lxml',
                         namespaceHTMLElements=False)
                 assert result
         base_url = find_base_url(result, base_url)