bc for setTrackerUrl command

assets/src/js/tracker.js

@@ -8,12 +8,17 @@ let config = {
 const commands = {
   "set": set,
   "trackPageview": trackPageview,
+  "setTrackerUrl": setTrackerUrl,
 };
 
 function set(key, value) {
   config[key] = value;
 }
 
+function setTrackerUrl(value) {
+  return set("trackerUrl", value);
+}
+
 // convert object to query string
 function stringifyObject(obj) {
   var keys = Object.keys(obj);