Changelog and Readme (#8591)

* Move changelog for 1.10.x

* Mark 1.9 EOL

* Prepare changelog for 1.10.3 stable

* Prepare changelog for 1.11.0 stable

* Update changelogs

* Update CHANGELOG for 1.10.3 beta

* Update CHANGELOG for 1.11.0 beta

* Update CHANGELOG for 1.11.0 beta

* Update CHANGELOG for 1.11.0 beta

* Format changelog

* Update README for 1.11

* Fix typo