Using --bypass throws an error instead of a deprecation warning

[mgomes]

Do you want to request a feature or report a bug?

bug

What is the current behavior?

If one attempts to use the now deprecated --bypass flag, an error is thrown rather than displaying a deprecation warning. This seems to be the result of #1789 (I think https://github.com/heroku/cli/blob/master/packages/certs-v5/lib/get_cert_and_key.js#L25)

➜ heroku certs:add -a my-app --bypass server.crt server.key
 ▸    cli is not defined

What is the expected behavior?

Something along the lines of:

➜ heroku certs:add -a my-app --bypass server.crt server.key
 ▸    WARNING: use of the --bypass flag is deprecated. The flag currently does not perform any additional behavior. Please remove --bypass