[component/vnu] add vnu 17.11.1

component/vnu/buildout.cfg

+# nu - The Nu Html Checker (v.Nu) is an ongoing experiment in better HTML checking.
+# https://validator.w3.org/nu/
+
+[buildout]
+parts =
+  vnu
+
+[vnu]
+recipe = hexagonit.recipe.download
+ignore-existing = true
+strip-top-level-dir = true
+url = https://github.com/validator/validator/releases/download/17.11.1/vnu.war_17.11.1.zip
+md5sum = 2af6dec153a5011cd6fcc85ce5fb599d
+
+[vnu-output]
+# Shared binary location to ease migration
+recipe = plone.recipe.command
+stop-on-error = true
+update-command = ${:command}
+command = ${coreutils-output:test} -r ${:war}
+war = ${vnu:location}/vnu.war