Changelog: bump version to 6.0 (#1222)

Author: robsdedude

CHANGELOG.md

@@ -3,6 +3,10 @@
 See also https://github.com/neo4j/neo4j-python-driver/wiki for a full changelog.
 
 ## NEXT RELEASE
+- No breaking or major changes.
+
+
+## Version 6.0
 - Python 3.7, 3.8, and 3.9 support has been dropped.
 - Remove deprecated package alias `neo4j-driver`. Use `pip install neo4j` instead.
 - Remove `setup.py`. Please use a recent enough packaging/build tool that supports `pyproject.toml`