Update README.md

Another tweak.

README.md

@@ -463,7 +463,7 @@ const raygunClient = new raygun.Client().init({
 });
 ```
 
-Setting `isOffline: true` tells the provider to start in `offline` mode. It will also trigger initialisations of respectively the connection to the cache as specified in `offlineStorageOptions`. 
+Setting `isOffline: true` tells the provider to start in `offline` mode. It will also trigger the initialisation of the cache, respectively - if the cache directory already exists - it will connect to the cache as specified in `offlineStorageOptions`.
 
 ##### Changing online/offline state