Prepare release 0.5.0

Author: rhpvorderman

CHANGELOG.rst

@@ -7,7 +7,7 @@ Changelog
 .. This document is user facing. Please word the changes in such a way
 .. that users understand how the changes affect the new version.
 
-version 0.5.0-dev
+version 0.5.0
 -----------------
 + Wheels are now build for MacOS arm64 architectures.
 + Fix a bug where READ and WRITE in zlib_ng.gzip_ng were inconsistent with the