Upgrade to babel-plugin-macros

[kentcdodds]

The project was renamed from babel-macros to babel-plugin-macros to better support babel v7. No other breaking changes.

[tkh44]

Thanks for letting us know

[kentcdodds]

Hopefully we'll finally get this into create-react-app! facebook/create-react-app#3675

[Haroenv]

I'll take a look now