Prepare for release 23.4.0 (#362)

Author: AlexWaygood

CHANGELOG.md

@@ -1,11 +1,11 @@
 # Change Log
 
-## Unreleased
+## 23.4.0
 
 * Update error messages for Y019 and Y034 to recommend using
   `typing_extensions.Self` rather than `_typeshed.Self`.
 
-## 23.1.1
+## 23.3.1
 
 New error codes:
 * Y053: Disallow string or bytes literals with length >50 characters.

pyi.py

@@ -39,7 +39,7 @@ def unparse(node: ast.AST) -> str:
     # and mypy thinks typing_extensions is part of the stdlib.
     from typing_extensions import Literal, TypeAlias, TypeGuard
 
-__version__ = "23.3.1"
+__version__ = "23.4.0"
 
 LOG = logging.getLogger("flake8.pyi")
 FLAKE8_MAJOR_VERSION = flake8.__version_info__[0]