v2.6.2
update changelog for version 2.6.2 (#1297) update changelog and readme for release 2.6.2 --------- Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com> Co-authored-by: Henry Schreiner <henry.fredrick.schreiner@cern.ch>