Incompatibility with react 17

[Gounlaf]

Bug report 🐞

Version & Environment

• Version of browser: doesn't matter
• Version of geist-ui/react: latest when reporting this issue: 2.1.5

Expected Behaviour

Usage of @geist-ui/reac should work with npm & yarn (according to the documentation)

Actual results (or Errors)

Someone reported in discussion #512 having an issue with npm, but resolved with yarn.
Looking at dependency tree, using styled-jsx@3.3.0 (strictly 3.3.0 ; not available for upgrade) require react@16 ; support for react@17 added in styled-jsx@3.3.1.

I guess yarn and npm resolve dependencies differently.

Edit: I can blindly update the dependency and make a PR, but I have no idea of the consequences...