Updated readme.

README.md

@@ -35,9 +35,17 @@ Then, register class alias by adding an entry in aliases section
 ];
 ```
 
-Finally, from the command line again, run `php artisan vendor:publish` to publish the default configuration file. 
+
+Finally, from the command line again, run 
+
+```
+php artisan vendor:publish --tag=config
+``` 
+
+to publish the default configuration file. 
 This will publish a configuration file named `onesignal.php` which includes your OneSignal authorization keys.
 
+> **Note:** If the previous command does not publish the config file successfully, please check the steps involving *providers* and *aliases* in the `config/app.php` file.
 
 
 ## Configuration

src/OneSignalServiceProvider.php

@@ -15,7 +15,7 @@ public function boot()
     {
         $configPath = __DIR__ . '/../config/onesignal.php';
 
-        $this->publishes([$configPath => config_path('onesignal.php')]);
+        $this->publishes([$configPath => config_path('onesignal.php')], 'config');
         $this->mergeConfigFrom($configPath, 'onesignal');
 
         if ( class_exists('Laravel\Lumen\Application') ) {