Android content rating ads godot 2.1

[Chaqierek]

OS target (Android/iOS):
Android

Godot version:
2.1.5

Issue description:
Hello, if i initiate the module like this:
admob.init(isReal, get_instance_ID())
Its working, test ad is appear, but i need init ads with content rating, i found this method:

initWithContentRating(isReal, get_instance_ID(), true, "G")
But now ads don't appear,so can anyone explain to me what I am doing wrong?

Have a nice day ;)

[gumaciel]

I think version 2.1.X is not working anymore, but on 3.1.X is working, can you try it? @Chaqierek