Add routes priorities in documentation

Signed-off-by: Emile Vauge <emile@vauge.com>

rules_test.go

@@ -3,6 +3,7 @@ package main
 import (
 	"github.com/containous/mux"
 	"net/http"
+	"net/url"
 	"testing"
 )
 
@@ -52,7 +53,6 @@ func TestParseTwoRules(t *testing.T) {
 	}
 }
 
-
 func TestPriorites(t *testing.T) {
 	router := mux.NewRouter()
 	router.StrictSlash(true)
@@ -130,4 +130,3 @@ type fakeHandler struct {
 func (h *fakeHandler) ServeHTTP(http.ResponseWriter, *http.Request) {
 
 }
-