For some reason this was left out when copying the feature list from the
release notes.

Signed-off-by: Arun Raghavan <arun@arunraghavan.net>

Some more contributors during the RC cycle.

Signed-off-by: David Henningsson <david.henningsson@canonical.com>

There have been several fixes to the Zsh completion during the current
development cycle, but the completion was initially implemented
already in 4.0.

Signed-off-by: David Henningsson <david.henningsson@canonical.com>

Short version based on Tanu's longer notes posted on list (and now on
the wiki, linked from this file.