Occasionally I get a React Warning about a semicolon. ``` Warning: Style property values shouldn't contain a semicolon. Check the render method of `ReactStickyState`. Try "marginTop: 0px" instead. ``` Seems to be related to [the use of fixedOffset](https://github.com/soenkekluth/react-sticky-state/blob/master/src/react-sticky-state.js#L289).