TODO: use secure protocol in recently added URL

Closes #733

docs/TODO

@@ -772,7 +772,7 @@ that doesn't exist on the server, just like --ftp-create-dirs.
  information that is stored in HTTP headers (RFC 6249). Theoretically this could
  also be supported with the --metalink option.
 
- See http://tools.ietf.org/html/rfc6249
+ See https://tools.ietf.org/html/rfc6249
 
  See also https://lists.gnu.org/archive/html/bug-wget/2015-06/msg00034.html for
  an implematation of this in wget.