Add changelog for release 1.4.0

[lizhuqi]

What type of PR is this?
/kind documentation

What this PR does / why we need it:
Release notes for upcoming 1.4.0 release

Which issue(s) this PR fixes:

Fixes #
N/A

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

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[mattcary]

Hmm, this is already in the 1.3.4 release notes, looks like the autodetect didn't work right, can you remove it? It may cause confusion when figuring out which version has which fix.

[lizhuqi]

Removed in the new commit.

[mattcary]

/ok-to-test

[mattcary]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lizhuqi, mattcary

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[lizhuqi]

/retest