Update the draft info in the README.

Author: Julian

README.rst

@@ -57,6 +57,8 @@ Features
 --------
 
 * Full support for
+  `Draft 2020-12 <https://python-jsonschema.readthedocs.io/en/latest/validate/#jsonschema.Draft202012Validator>`_,
+  `Draft 2019-09 <https://python-jsonschema.readthedocs.io/en/latest/validate/#jsonschema.Draft201909Validator>`_,
   `Draft 7 <https://python-jsonschema.readthedocs.io/en/latest/validate/#jsonschema.Draft7Validator>`_,
   `Draft 6 <https://python-jsonschema.readthedocs.io/en/latest/validate/#jsonschema.Draft6Validator>`_,
   `Draft 4 <https://python-jsonschema.readthedocs.io/en/latest/validate/#jsonschema.Draft4Validator>`_