Consider using passive event listeners

[jsphstls]

When rendering a Downshift component in Chrome, I see this message logged in the console:

[Violation] Added non-passive event listener to a scroll-blocking 'touchstart' event. Consider marking event handler as 'passive' to make the page more responsive. See https://www.chromestatus.com/feature/5745543795965952

Chrome developer tools indicates that these listeners are not passive:
https://github.com/downshift-js/downshift/blob/master/src/hooks/utils.js#L421-L425

Would it be possible to make these listeners passive without affecting functionality?

[silviuaavram]

Hey @jsphstls thanks for suggesting this? Can you look into this and suggest an improvement? I'd gladly review it. Thanks!

[jsphstls]

@silviuaavram #1652