Replace http:....roundup-tracker.org with https.

Author: rouilj

roundup/cgi/client.py

@@ -489,7 +489,7 @@ def main(self):
     def handle_xmlrpc(self):
         if self.env.get('CONTENT_TYPE') != 'text/xml':
             self.write(b"This is the endpoint of Roundup <a href='" +
-                b"http://www.roundup-tracker.org/docs/xmlrpc.html'>" +
+                b"https://www.roundup-tracker.org/docs/xmlrpc.html'>" +
                 b"XML-RPC interface</a>.")
             return