React 16 compatibility?

[schwers-zz]

apologies if this is a duplicate, but is this library compatible with react 16? When I tried upgrading I'm getting the following error in React

I believe this is due to lines:

https://github.com/dazld/react-on-visible/blob/master/src/index.js#L39

and

https://github.com/dazld/react-on-visible/blob/master/src/index.js#L47

The react docs specify that the first argument should be a function that returns state when the second callback param is used https://reactjs.org/docs/react-component.html#setstate

[dazld]

fixed in #17