Support React 17

#110 Allow to render tooltip with custom text by Sergo(@rogaldh)

Fixed #49 Fixed #48

Fixed #41 BigPlayButton Arrests Keyboard

Add crossOrigin prop to Video PR#37 by Juan D.(@juandjara)

Fixed issue that the player can't get blur event

• Rewrited Menu component.
• Changed component name from PlaybackRate to PlaybackRateMenuButton.
• Fixed full screen bug on iPhone.
• Added travis-ci config