Broken with click 7

[jayvdb]

https://travis-ci.org/jayvdb/click-aliases/jobs/568251511

runner = <click.testing.CliRunner object at 0x7fb65f97a550>
    def test_cli(runner):
        result = runner.invoke(cli)
>       assert result.output == TEST_CLI
E       AssertionError: assert 'Usage: cli [... ship (boat)\n' == 'Usage: cli [O...ages ships.\n'
E         Skipping 116 identical leading characters in diff, use -v to show
E         - ine (bomb)
E         -   ship (boat)
E         + ine (bomb)  Manages mines.
E         +   ship (boat)  Manages ships.
tests/test_naval.py:88: AssertionError

________________________________ test_ship_help ________________________________
runner = <click.testing.CliRunner object at 0x7fb65f97b110>

    def test_ship_help(runner):
        for cmd in ['ship', 'boat']:
            result = runner.invoke(cli, [cmd])
>           assert result.output == TEST_SHIP_HELP.format(cmd=cmd)
E           AssertionError: assert 'Usage: cli s...shoot (fire)\n' == 'Usage: cli sh...ire to X,Y.\n'
E             Skipping 134 identical leading characters in diff, use -v to show
E             - ,navigate)
E             -   new (add,build,create)
E             -   shoot (fire)
E             + ,navigate)   Moves SHIP to the new location X,Y.
E             +   new (add,build,create)  Creates a new ship.
E             +   shoot (fire)            Makes SHIP fire to X,Y.