w3-validator: update to "v1.3+hg", what's used today on https://validator.w3.org/

component/w3-validator/buildout.cfg

@@ -37,6 +37,6 @@ depends =
   ${perl-XML-LibXML:location}
   ${perl-libwww-perl:location}
 perl-path = ${perl:location}/bin/perl
-# validator-1_3-release in https://dvcs.w3.org/hg/markup-validator/tags
-validator-url = https://dvcs.w3.org/hg/markup-validator/archive/6c6c7c1f69c5.tar.bz2
+# tip as of 2017-11-22 in https://dvcs.w3.org/hg/markup-validator/tags
+validator-url = https://dvcs.w3.org/hg/markup-validator/archive/35b522f708d2.tar.bz2
 dtd-url =