README: clarify Fabric-2.x / Fabric3 stuff

README.rst

@@ -7,12 +7,17 @@ and is intended to add only bug fixes and compatibility patches, for projects
 already using Fabric-1.x in some way. It includes python3 compatibility patches
 from `Fabric3 <https://github.com/mathiasertl/fabric/>`_.
 
+Upstream Fabric is now on version 2.x. Fabric-2.x is python3 compatible,
+and comes *after* Fabric3. Fabric-2.x has significant compatibility-breaking
+changes, in order to fix some long-standing limitations.
+
 You probably should not use this for new projects, in that case you should
-consider Fabric-2.x from http://www.fabfile.org/ or maybe Ansible or something else.
+consider Fabric-2.x - see http://www.fabfile.org/
 
 ------
 
-fab-classic is `on PyPI <https://pypi.org/project/fab-classic/>`_, so you can ``pip install fab-classic``
+fab-classic is `on PyPI <https://pypi.org/project/fab-classic/>`_,
+so you can ``pip install fab-classic``
 
 .. image:: https://travis-ci.org/ploxiln/fab-classic.svg?branch=master
     :target: https://travis-ci.org/ploxiln/fab-classic