Update to support React 17

[mahmood-kn]

Hi, Please update react-jw-player to support newer versions of React (React 17)

[FranCarstens]

I've created a pull request to include React 17 in the peer dependencies. I ran into no issues using this on a React 17 project. There may be issues I'm not aware of, though. #198

[FranCarstens]

@mahmood-kn, it doesn't look like this is maintained anymore. Maybe try JW Player's official library? https://github.com/jwplayer/jwplayer-react