Fow indexed access types results in `unknow`

[pascalduez]

Hi,

I guess this is similar to #367, #369 for TS.

Using an indexed access type for a component prop result in unknow. Whereas it should result in Type['index'].
Either using types or interfaces.

// @flow 

type Foo = {
  name: string
}

type Props = {
  name: Foo['name']
}

// @component
function Component(props: Props) {}

[
  {
    "description": "",
    "displayName": "Component",
    "methods": [],
    "props": {
      "name": {
        "required": true,
        "flowType": {
          "name": "unknown"
        },
        "description": ""
      }
    }
  }
]

[pascalduez]

That was fast, thanks @danez!

[danez]

This will be available in 6.0.4