Mention that Pulp supports OCI Artifacts too

Author: lubosmj

README.rst

@@ -6,7 +6,7 @@
 
 This is the ``pulp_container`` Plugin for `Pulp Project
 3.0+ <https://pypi.python.org/pypi/pulpcore/>`__. This plugin provides Pulp with support for container
-images, similar to the pulp_docker plugin for Pulp 2.
+images and OCI artifacts.
 
 For more information, please see the `documentation
 <https://docs.pulpproject.org/pulp_container/>`_ or the `Pulp project page