Fixes type error with React
Fixes type error with React

Fixes the following TypeScript error:
 
```
ERROR in /path/to/node_modules/fela/index.d.ts
(3,10): error TS1192: Module '"/path/to/node_modules/@types/react/index"' has no default export.
```

While we tweak our build tools to infer a default export in cases where this isn't one, we don't actually need the whole `React` object here, just the `CSSProperties` type. So should limit the import to avoid potential build errors.
rofrischmann/fela,RafalFilipek/fela,derek-duncan/fela,derek-duncan/fela,risetechnologies/fela,RafalFilipek/fela,derek-duncan/fela,as-com/alef,derek-duncan/fela,rofrischmann/fela,as-com/alef,as-com/alef,derek-duncan/fela,derek-duncan/fela,rofrischmann/fela,RafalFilipek/fela,RafalFilipek/fela,RafalFilipek/fela,risetechnologies/fela,RafalFilipek/fela,risetechnologies/fela