Removing componentWillMount

[JeroenReumkens]

Hi,

Currently the React team is preparing for Concurrent Mode (previously known as Async Mode). To prepare my own app for that, I started wrapping my app in <React.StrictMode>. By doing so I noticed that React Media still implements componentWillMount, something the team advices to remove as soon as possible to prepare for concurrent mode. See https://reactjs.org/docs/react-component.html#unsafe_componentwillmount

I was wondering if there are any plans in removing this (maybe changing it to componentDidMount will already be sufficient?

I'm happy to make a PR if you can confirm changing this should work.

Thanks for all the effort!

[edorivai]

Hi, this is already taken care of in #96.

Thanks!