Improve pickAttrs

[cncolder]

This is useful for filter out react unknown props then safely pass to dom element.

styled-components/utils/validAttr.js is a good example.

Use {}.hasOwnProperty replace Array.indexOf. It's boost more than 10x faster.

[paranoidjk]

LGTM.

@cncolder Would you like PR?

[benjycui]

ping~

[abenhamdine]

in FF, seems even 20X faster :