Add changelog entry for #842 (#845)
Add changelog entry for #842 (#845)

* add changelog for memory options

* formats

* Update CHANGELOG.md

* Update CHANGELOG.md

Co-authored-by: huangjeff5 <bf1838d19c213098700f06e878cd21cfa9bf2a67@users.noreply.github.com>
firebase/firebase-functions,firebase/firebase-functions,firebase/firebase-functions