[VOTE] Release Apache Superset 1.4.0 based on Superset 1.4.0rc2

[el...@apache.org]

Hello Superset Community,

This is a call for the vote to release Apache Superset version 1.4.0.

The release candidate:
https://dist.apache.org/repos/dist/dev/superset/1.4.0rc2/

Git tag for the release:
https://github.com/apache/superset/tree/1.4.0rc2

The Change Log for the release:
https://github.com/apache/superset/blob/1.4.0rc2/CHANGELOG.md

The Updating instructions for the release:
https://github.com/apache/superset/blob/1.4.0rc2/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