Add support for Python 3.10. (#217)

Author: Michael Howitz

CHANGES.rst

@@ -6,12 +6,12 @@ Changes
 
 - Document that ``__name__`` is needed to define classes.
 
+- Add support for Python 3.10. Auditing the Python 3.10 change log did not
+  reveal any changes which require actions in RestrictedPython.
+
 - Avoid deprecation warnings when using Python 3.8+.
   (`#192 <https://github.com/zopefoundation/RestrictedPython/issues/192>`_)
 
-- Allow to use the package with Python 3.10 -- Caution: No security audit has
-  been done so far.
-
 
 5.1 (2020-10-07)
 ----------------