Commits on Jun 26, 2018

1. docs: <release> tag can have <url> children tags. …

   This is useful to provide a link specific to a given version of a
   software, rather than a generic link meant for the whole project.
   Typically you may want to link a release note, or a detailed news which
   may give much more information than the <description> and/or probably
   more context, images and examples, etc.

   Jehan committed Jun 26, 2018
   4d540d2