added preview for files which spaces in names.

[SubeetKD]

No description provided.

[tjdevries]

Ah, this probably fixes the problem, but what we might want to do is probably switch over to the way of sending a list to termopen or something. That will handle auto-escaping for us (like if the file has a " in it, i think the current way will break, for example).

What do you think about that?

[SubeetKD]

Yes you are right it will break. I don't know much of lua and vimscript so I don't think I can solve this.

[tjdevries]

That's ok, this is still a good improvement! We can try and fix the other thing later. Thanks for the PR!!