explain who owns cwltool

Author: mr-c

README.rst

@@ -85,10 +85,12 @@ The ``cwlref-runner`` package is optional and provides an additional entry point
 under the alias ``cwl-runner``, which is the implementation-agnostic name for the
 default CWL interpreter installed on a host.
 
+``cwltool`` is provided by the CWL project, `a member project of Software Freedom Conservancy <https://sfconservancy.org/news/2018/apr/11/cwl-new-member-project/>`_
+
 Install
 -------
 
-Your operating system may offer cwltool directly. For [Debian](https://tracker.debian.org/pkg/cwltool "Debian cwltool package tracker") or [Ubuntu](https://launchpad.net/ubuntu/+source/cwltool "Ubuntu Launchpad overview for cwltool") try
+Your operating system may offer cwltool directly. For `Debian <https://tracker.debian.org/pkg/cwltool>`_  or `Ubuntu <https://launchpad.net/ubuntu/+source/cwltool>`_ try
 
 .. code:: bash