Add --verbose flag

[fisker]

When run del-cli on huge directory, I'd like to see the progress.

[sindresorhus]

What would it look like? Progress bar, showing each file as it's being deleted, something else?

[fisker]

showing each file as it's being deleted

This.

Progress bar

Not care that much.

something else?

Nope.

[sindresorhus]

Yeah, sounds good. We'll need to add a progress event to sindresorhus/del#133

Similar to https://github.com/sindresorhus/cpy#progress-reporting

The flag should be --verbose.

[fisker]

Don't you think return a generator instead of sorted array in del can have better performance? Unless we want know the length of matched files.

[sindresorhus]

Why would a generator have better performance? It has to go through all the files anyway. Unless I'm misunderstanding what you mean?

[fisker]

You're right, I thought it run delete after sort, never mind.