Add newline to no-arg output from cli-script.php

[robbieaverill]

If I run cli-script.php with no arguments, the message doesn't have a line drop. Suggestion is to add one for clarity:

root@576558d6b517:/var/www/framework# php cli-script.php       
Please specify an argument to cli-script.php/sake. For more information, visit http://docs.silverstripe.org/en/developer_guides/cliroot@576558d6b517:/var/www/framework#

Better:

root@576558d6b517:/var/www/framework# php cli-script.php       
Please specify an argument to cli-script.php/sake. For more information, visit http://docs.silverstripe.org/en/developer_guides/cli
root@576558d6b517:/var/www/framework#

[tractorcow]

Yes please. Can you PR to https://github.com/silverstripe/silverstripe-framework/blob/3/cli-script.php?