Updated 2.1.1 release notes

Author: fgmacedo

docs/releases/2.1.1.md

@@ -1,8 +1,10 @@
 # StateMachine 2.1.1
 
-*Not released yet*
+*August 3, 2023*
+
 
 ## Bugfixes in 2.1.1
 
 - Fixes [#391](https://github.com/fgmacedo/python-statemachine/issues/391) adding support to
   [pytest-mock](https://pytest-mock.readthedocs.io/en/latest/index.html) `spy` method.
+- Improved factory type hints [#399](https://github.com/fgmacedo/python-statemachine/pull/399).