Superset - 3.0.0-rc4

Subject: [VOTE] Release Apache Superset 3.0.0 based on Superset 3.0.0rc4

Hello Superset Community,

This is a call for the vote to release Apache Superset version 3.0.0.

The release candidate:
https://dist.apache.org/repos/dist/dev/superset/3.0.0rc4/

Git tag for the release:
https://github.com/apache/superset/tree/3.0.0rc4

The Change Log for the release:
https://github.com/apache/superset/blob/3.0.0rc4/CHANGELOG.md

The Updating instructions for the release:
https://github.com/apache/superset/blob/3.0.0rc4/UPDATING.md

Public keys are available at:
https://www.apache.org/dist/superset/KEYS

The vote will be open for at least 72 hours or until the necessary number
of votes are reached.

Please vote accordingly:

[ ] +1 approve
[ ] +0 no opinion
[ ] -1 disapprove with the reason

Thanks,
The Apache Superset Team