Set date of release in release_notes.rst.
@@ -23,8 +23,8 @@ the underlying principles are the same, and so conversion of
code and stored events is very possible.
-Version 9.1.0 (18 August 2021)
-------------------------------
+Version 9.1.0 (released 18 August 2021)
+---------------------------------------
Added support for setting environment when constructing application.
Added "eq" and "repr" methods on aggregate base class.
