Support Ctrl-G for exiting the Clap window

[hupfdule]

I can close the Clap popup window with Esc (or ^[) without executing any action.

I'd like to have Ctrl-g added as additional key binding for doing that.

Ctrl-g is a standard key binding in a lot of applications (like GNU readline) for cancelling the current action. Therefore I usually hit that keybinding instead of Esc2, which does nothing in Clap.

Actually this is only half of the truth. If I (accidently) hit Ctrl-g and realize it does nothing in Clap, I hit Esc. But that does nothing, too, in that case! I have have to hit Esc again to actually close the Clap window.

Even if you don't consider adding Ctrl-g as default keybinding, you should add a section to the README about how to add additional keybindings for the builtin functions (like already requested in #104). That makes it easier to use non-standard keybindings for the clap-provided functionality.

[hupfdule]

Wow, that's fast!

Many thanks. :-)