New GDScript keywords

[Calinou]

New keywords were recently added to GDScript, it would be cool if there was support for those in this plugin.

Those keywords are onready (godotengine/godot@30c1229) and breakpoint (godotengine/godot@7d2d144).

[quabug]

Thanks for your report. I will update script later after vacation. And I also suggest you to fork your own repo, since I'm not using godot currently.