fix: Symfony deprecation

Author: zembrowski

tests/CommandTest.php

@@ -36,7 +36,7 @@
     $browser = new HttpBrowser($client);
 
     $application = new Application;
-    $application->add(new RetrieveCommand($browser));
+    $application->addCommand(new RetrieveCommand($browser));
 
     $command = $application->find('tse-id:retrieve');
 
@@ -62,7 +62,7 @@
     $browser = new HttpBrowser($client);
 
     $application = new Application;
-    $application->add(new RetrieveCommand($browser));
+    $application->addCommand(new RetrieveCommand($browser));
 
     $command = $application->find('tse-id:retrieve');
     $tester = new CommandTester($command);
@@ -108,7 +108,7 @@
     $browser = new HttpBrowser($client);
 
     $app = new Application;
-    $app->add(new RetrieveCommand($browser));
+    $app->addCommand(new RetrieveCommand($browser));
 
     $command = $app->find('tse-id:retrieve');
     $tester = new CommandTester($command);