Fix incorrect documentation URL

lib/timeline/component/CustomTime.js

@@ -118,7 +118,7 @@ CustomTime.prototype.redraw = function () {
   var locale = this.options.locales[this.options.locale];
   if (!locale) {
     if (!this.warned) {
-      console.log('WARNING: options.locales[\'' + this.options.locale + '\'] not found. See http://visjs.org/docs/timeline.html#Localization');
+      console.log('WARNING: options.locales[\'' + this.options.locale + '\'] not found. See http://visjs.org/docs/timeline/#Localization');
       this.warned = true;
     }
     locale = this.options.locales['en']; // fall back on english when not available