Update vendor

vendor/github.com/labstack/echo/cookbook/google-app-engine/app-engine.go

@@ -0,0 +1,17 @@
+// +build appengine
+
+package main
+
+import (
+	"net/http"
+
+	"github.com/labstack/echo"
+)
+
+func createMux() *echo.Echo {
+	e := echo.New()
+	// note: we don't need to provide the middleware or static handlers, that's taken care of by the platform
+	// app engine has it's own "main" wrapper - we just need to hook echo into the default handler
+	http.Handle("/", e)
+	return e
+}