Add Jia Zhai and Enrico Olivelli to PMC list
Add Jia Zhai and Enrico Olivelli to PMC list

Author: Enrico Olivelli <eolivelli@apache.org>

Reviewers: Matteo Merli <mmerli@apache.org>, Sijie Guo <sijie@apache.org>

This closes #1212 from eolivelli/fix/update-pmc-list

apache/bookkeeper,sijie/bookkeeper,sijie/bookkeeper,apache/bookkeeper,sijie/bookkeeper,ivankelly/bookkeeper,sijie/bookkeeper,sijie/bookkeeper,apache/bookkeeper,sijie/bookkeeper,ivankelly/bookkeeper,ivankelly/bookkeeper,sijie/bookkeeper,apache/bookkeeper,apache/bookkeeper,apache/bookkeeper,sijie/bookkeeper