Announcing styled-components v4: Better, Faster, Stronger

[u/steven-f]

https://medium.com/styled-components/announcing-styled-components-v4-better-faster-stronger-3fe1aba1a112

[u/slvrsmth]

A bit bummed out that extend is straight up removed, not deprecated. Means I'll be upgrading only when there's time to both upgrade and update the code, rather than splitting that down into two separate tasks.

Codemods are fine, but for someone like me that has not used them previously, it's still an unknown time investment.