bug #1486 [make:entity] Fix exception message if mercure bundle not f…

…ound with --broadcast

src/Maker/MakeEntity.php

@@ -163,7 +163,7 @@ public function interact(InputInterface $input, ConsoleStyle $io, Command $comma
 
             // Mercure is needed
             if ($isBroadcast && !class_exists(MercureExtension::class)) {
-                throw new RuntimeCommandException('Please run "composer require symfony/mercure". It is needed to broadcast entities.');
+                throw new RuntimeCommandException('Please run "composer require symfony/mercure-bundle". It is needed to broadcast entities.');
             }
 
             $input->setOption('broadcast', $isBroadcast);