`-kms` -> `-key`
`-kms` -> `-key`

This flag was changed in v0.3.1

Signed-off-by: Jake Sanders <d7c79a945d71c8c27d84b007687c1a4cfff8858e@google.com>

GoogleContainerTools/distroless,GoogleContainerTools/distroless,GoogleContainerTools/distroless