Fixes youtube player playsinline variable type

[gregorybolkenstijn]

I found this bug when embedding a Youtube player on Safari mobile. Passing true would create playsinline=true, which didn't enable the inline playback. I could fix it by passing 1 as value, but then I got this warning: Warning: Failed prop type: Invalid prop 'playsinline' of type 'number' supplied to 'Player', expected 'boolean'.

playsinline should be a number as per the Youtube player documentation: https://developers.google.com/youtube/player_parameters#playsinline

Valid values are:
0: This value causes fullscreen playback. This is currently the default value, though the default is subject to change.
1: This value causes inline playback for UIWebViews created with the allowsInlineMediaPlayback property set to TRUE.

[storyworks]

Maybe you could update the types defined in https://github.com/CookPete/react-player/blob/master/src/props.js from bool to 0 | 1?

[cookpete]

Thanks for the PR @gregorybolkenstijn !

@storyworks There is no need to change the types. The prop is still a bool – this just maps that bool to 0 or 1 in the youtube player params.