Call subclass RNNAppDelegate

## 📚 Documentation

Do we need to mention in the docs that super class need to be called too ?

```diff
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
+    // Call subclass RNNAppDelegate
+    [super application:application didFinishLaunchingWithOptions:launchOptions];

```