Build: Updating the main version to 1.13.4-pre.

Author: mgol

package.json

@@ -2,7 +2,7 @@
 	"name": "jquery-ui",
 	"title": "jQuery UI",
 	"description": "A curated set of user interface interactions, effects, widgets, and themes built on top of the jQuery JavaScript Library.",
-	"version": "1.13.3-pre",
+	"version": "1.13.4-pre",
 	"homepage": "https://jqueryui.com",
 	"author": {
 		"name": "OpenJS Foundation and other contributors",