Feature Request: Add ability to set expire time on statuses

[theleewise]

It'd be really useful to be able to set an expire time when updating a status.

Edit status via arguments:
slack status edit lunch :hamburger: 60

Edit status via options:
slack status edit --text lunch --emoji :hamburger: --expire 60

Edit status via short form options:
slack status edit --tx lunch -em :hamburger: -ex 60

It appears this could be easily done by adding status_expiration.

I would implement myself and make a pull request but my bash skills are not so hot.

[daniel-at-mvst]

I'm also looking for that feature.