Please welcome aboard new PPMC member & Committer: Joy Gao

[Sid Anand]

Folks!
Please welcome aboard new PPMC member & Committer: Joy Gao

   - Announcement:
   
https://cwiki.apache.org/confluence/display/AIRFLOW/Announcements#Announcements-Nov30,2017

Warm Regards,
The Apache Airflow PPMC/Committers