adding URL property to Hook struct

github/repos_hooks.go

@@ -70,6 +70,7 @@ type Hook struct {
 	CreatedAt *time.Time             `json:"created_at,omitempty"`
 	UpdatedAt *time.Time             `json:"updated_at,omitempty"`
 	Name      *string                `json:"name,omitempty"`
+	URL       *string                `json:"url,omitempty"`
 	Events    []string               `json:"events,omitempty"`
 	Active    *bool                  `json:"active,omitempty"`
 	Config    map[string]interface{} `json:"config,omitempty"`