Make comment block raw to avoid travis ci warning on \d in comment block.

Author: rouilj

test/test_templating.py

@@ -296,7 +296,7 @@ def t(s): return p.hyper_re.sub(p._hyper_repl, s)
             ae(t('http://roundup.net/%c/' % c),
                '<a href="http://roundup.net/%c/" rel="nofollow noopener">http://roundup.net/%c/</a>' % (c, c))
 
-'''
+r'''
 class HTMLPermissions:
     def is_edit_ok(self):
     def is_view_ok(self):