Fix to not call mediumZoom if the page does not move.

Author: daisuke-yoshimoto

src/zoom.js

@@ -33,12 +33,15 @@ export default (function () {
 
 
   return {
-    onRouteUpdate({ location }) {
-
+    onRouteUpdate({ location , previousLocation}) {
       if( location && location.hash && location.hash.length ) {
         return;
       }
 
+      if (!previousLocation || location.pathname === previousLocation.pathname) {
+        return;
+      }
+
       setTimeout(() => {
         mediumZoom(selector, options);
       }, 1000);