Make it clear that support for draft2020-12 is partial unfortunately.

Support for dynamicRef will come with a redesign of ref resolution,
but can't keep blocking the release.

CHANGELOG.rst

@@ -1,8 +1,8 @@
-v4.0.0 (Not Yet Released)
--------------------------
+v4.0.0
+------
 
-* Support for Draft 2020-12 (as well as 2019-09). Big thanks to Thomas Schmidt
-  and Harald Nezbeda.
+* Partial support for Draft 2020-12 (as well as 2019-09).
+  Thanks to Thomas Schmidt and Harald Nezbeda.
 * ``False`` and ``0`` are now properly considered non-equal even
   recursively within a container (#686). As part of this change,
   ``uniqueItems`` validation may be *slower* in some cases. Please feel
@@ -25,6 +25,11 @@ v4.0.0 (Not Yet Released)
 * ``multipleOf`` could overflow when given sufficiently large numbers. Now,
   when an overflow occurs, ``jsonschema`` will fall back to using fraction
   division (#746).
+* ``jsonschema.__version__``, ``jsonschema.validators.validators``,
+  ``jsonschema.validators.meta_schemas`` and
+  ``jsonschema.RefResolver.in_scope`` have been deprecated, as has
+  passing a second-argument schema to ``Validator.iter_errors`` and
+  ``Validator.is_valid``.
 
 v3.2.0
 ------

README.rst

@@ -60,9 +60,11 @@ It can also be used from console:
 Features
 --------
 
-* Full support for
-  `Draft 2020-12 <https://python-jsonschema.readthedocs.io/en/latest/validate/#jsonschema.Draft202012Validator>`_,
+* Partial support for
+  `Draft 2020-12 <https://python-jsonschema.readthedocs.io/en/latest/validate/#jsonschema.Draft202012Validator>`_ and
   `Draft 2019-09 <https://python-jsonschema.readthedocs.io/en/latest/validate/#jsonschema.Draft201909Validator>`_,
+  except for ``dynamicRef`` / ``recursiveRef`` and ``$vocabulary`` (in-progress).
+  Full support for
   `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>`_