Updating SW JS output

wp-sw-cache/lib/service-worker.js

@@ -11,7 +11,7 @@
       caches.open(CACHE_NAME)
         .then(function(cache) {
           // Add all offline dependencies to the cache
-          console.log('[install] Caches opened, adding all core components' +
+          console.log('[install] Caches opened, adding all core components ' +
             'to cache');
           return cache.addAll(CACHE_FILES);
         })