v0.4.0

🎉 Hello world, I'm a new release for better work!

1. Support adding/changing/yanking surrounds
2. Support adding/changing/yanking surrounded text objetct.
3. Support changing the case of surrounded text object.
4. Support moving around surrounds.
5. Better keybindings and key response speed.
6. Support 2 kinds of surround operating keybindings, classic mode
   (verb->s->surround) or s-prefix mode (s->verb->surround).
7. Fix surround of double quotes not working.
8. Fix the grep compatibility issue on MacOS (#1).
9. Fix wrong region highlight issue.

Welcome to update to this version!