Hover on labeled args in component only works partially.

[Cristiano Calcagno]

On this example:

@react.component
let make = (~name) => React.string(name)

hover on name works on "bs-platform": "9.0.2" but not on "rescript": "9.1.0".

Instead this does not work on either:

@react.component
let make = (~name : string) => React.string(name)

[Cristiano Calcagno]

The former is handled here: #133