Port attribute in route should be nullable

[Dray56]

According to the cloudfoundry docs, port parameter of route can be null. If that is the case the port attribute in the route struct should be nullable.

type Route struct {
	Host         string             `json:"host"`
	Path         string             `json:"path"`
	URL          string             `json:"url"`
	Protocol     string             `json:"protocol"`
	Port         int                `json:"port"`
	Destinations []RouteDestination `json:"destinations"`

	Metadata      *Metadata          `json:"metadata"`
	Relationships RouteRelationships `json:"relationships"`
	Resource      `json:",inline"`
}

However in the existing structure, port is just an integer so while receiving the response null values will get converted to arbitrary integer values. Better will be to change it to a pointer.