Update README.md for v5.2 (interactive deprecation)

[blnvdanil]

In 5.2 viewport's version a breaking change was made, that replaced interactive boolean with eventMode, which means that people with pixi.js < 7.2 are not able to use v5.2

Seems that those changes should be emphasized in readme.

[blnvdanil]

Or maybe It will be better to use interactive and eventMode at the same time, but in order to prevent deprecation warnings we can do this dirty trick console.log = () => {}

[davidfig]

Thanks!