Added done option on toolbar so that we can remove the keyboard directly

[RaviRanjan-11]

Hi There was an small issue for removing keyboard once we are done with editing we have to tap on another field than only after we can remove the Keyboard

I have added just 2 line of code and given an option for keyboard dismiss on done button

[RaviRanjan-11]

func richEditorToolbarDone(_ toolbar: RichEditorToolbar) { self.view.resignFirstResponder() }