requestExerciseRoute has a wrong type

I think there is an error with the `requestExerciseRoute` method, at the moment it returns this type:
```
export interface ExerciseRoute {
  type?: ExerciseRouteResultType; // ReadRecord(s) will always populate this, write and readExerciseRoute will not
  route: Location[];
}
```

but in reality the promise return an array of Locations