New subscription after prop changes uses old props

Haven't tested, but looking at the code,

https://github.com/jayphelps/react-observable-subscribe/blob/59085860d0369483ed2cf8c101aba77578a0bea4/src/index.js#L63-L68

When the props change, setupSubscription is called; however, setupSubscription uses this.props.children (the old props) instead of nextProps.children

Start in src/index.js at lines 63-68 and trace setupSubscription during prop changes. Verify the subscription setup uses the new children from nextProps rather than the previous props, then confirm that a prop change creates a subscription for the updated children.

Written by the indexing model from the issue text.