Custom component can receive onAccept prop using a children function

[lvauvillier]

There was no possibility to bind the onAccept callback to a custom element to dismiss the banner.

This PR solves this allowing to set a function as children with a onAccept argument. This function must return a valid react element.

[lvauvillier]

Thanks for your review. I just push a new version. Eslint now raise an error due to the definition of MyOtherComponent. Tell me if you prefer adding a new rule, or a eslint-disable-line comment to catch this error.

[gabro]

@lvauvillier I pushed a commit to your branch that should fix the ESLint issue ;)

[nemobot]

[gabro]

Thanks @lvauvillier 🎉