Bump hypothesis-python version to 6.91.0 and update changelog

[skip ci]

Author: DRMacIver

hypothesis-python/RELEASE.rst

@@ -18,6 +18,17 @@ Hypothesis 6.x
 
     .. include:: ../RELEASE.rst
 
+.. _v6.91.0:
+
+-------------------
+6.91.0 - 2023-11-27
+-------------------
+
+This release adds an optional ``payload`` argument to :func:`hypothesis.event`,
+so that you can clearly express the difference between the label and the value
+of an observation.  :ref:`statistics` will still summarize it as a string, but
+future observability options can preserve the distinction.
+
 .. _v6.90.1:
 
 -------------------

hypothesis-python/docs/changes.rst

@@ -8,5 +8,5 @@
 # v. 2.0. If a copy of the MPL was not distributed with this file, You can
 # obtain one at https://mozilla.org/MPL/2.0/.
 
-__version_info__ = (6, 90, 1)
+__version_info__ = (6, 91, 0)
 __version__ = ".".join(map(str, __version_info__))