Delete trailing whitespace (#73)

Author: paulb777

Firebase/Auth/Source/FIRAuth.m

@@ -401,7 +401,7 @@ - (instancetype)initWithAPIKey:(NSString *)APIKey appName:(NSString *)appName {
     _notificationManager =
         [[FIRAuthNotificationManager alloc] initWithApplication:[UIApplication sharedApplication]
                                            appCredentialManager:_appCredentialManager];
-    
+
     [[FIRAuthAppDelegateProxy sharedInstance] addHandler:self];
     #endif
   }