Add v1.9 changelog, and update the version matrix in the README.md.#166

Merged

qiuming-best merged 1 commit intovmware-tanzu:mainfrom blackpiglet:v1.9_changelog

Dec 20, 2023

+5-1

Commits on Dec 19, 2023

Add v1.9 changelog, and update the version matrix in the README.md.
Xun Jiang
committed