Headers information is lost for DirectionsResponse when routeOptions are added

[osana]

Response and Response (after #759 is merged) loose original request headers.

The culprit seems to be how we use Response.success()

mapbox-java/services-directions/src/main/java/com/mapbox/api/directions/v5/MapboxDirections.java

Line 113 in ac054f1

return Response.success(response.body().toBuilder().routes(

we should change it to

      response.body()
        .toBuilder()
        .matchings(generateRouteOptions(response))
        .build(),
      new okhttp3.Response.Builder()
        .code(200)
        .message("OK")
        .protocol(response.raw().protocol())
        .headers(response.headers())
        .request(response.raw().request())
        .build());```