4.0 proptype error when used with react router

[frehner]

React Router currently expects a function as a component for Routes. However, React.forwardRef returns an object instead of a function, which then fails the prop type validation. See remix-run/react-router#6384 for more details

In other words, if you wrap a component in @Cancelable, you'll get a proptype warning if you use that component in <Route path="/" component={WrappedComponent} /> since v4 is now using the forward ref API.