Include fred's release notes for 1.4.0.

He is unfortunately out of power and internet because of storms :(

Docker-DCO-1.1-Signed-off-by: Fred Lifton <fred.lifton@docker.com> (github: fredlf)
Docker-DCO-1.1-Signed-off-by: Jessica Frazelle <jess@docker.com> (github: jfrazelle)
Merge pull request #9627 from jfrazelle/release-notes

Include Fred's release notes for 1.4.0.