Dry-run indication (feature request)

[noamgot]

Feature request - dry-run indication

when using --dry-run flag, there's no clear indication that this is a dry run.
IMHO, it would be useful to add some textual indication for this (like the one that exists in awscli, for instance).

Example:
instead of

> s5cmd rm <path>
rm <path>

I suggest:

> s5cmd rm <path>
(dry-run) rm  <path>