v0.2.0

This release replaces the --uri flag with a --port flag and introduces a
new --shutdown flag.

When the --shutdown flag is provided, the given command is forked
(instead of simply exec'd) and the linkerd-await program forwards
SIGTERM to the child process. When the child process completes, the
proxy is shutdown via its admin interface. This behavior only operates
as expected with as-of-yet unreleased proxy versions that support the
/shutdown admin endpoint (linkerd/linkerd2-proxy#811). With prior proxy
versions, the /shutdown call will not succeed and the proxy will remain
running.