The new `--new` or `-n` flag allows to create a new revision after the
single revision being described.
Running `jj-cz --new` is the equivalent of running `jj-cz --new @`,
describing the current revision and creating a new revision after it.
Passing several revisions to `jj-cz` with the `--new` flag will result
in an error.
phundrak
5aa382a4c9
