Adding return types to commands.

src/Command/TelegramSendMessageCommand.php

@@ -21,7 +21,7 @@ class TelegramSendMessageCommand extends Command
         parent::__construct();
     }
 
-    protected function configure()
+    protected function configure(): void
     {
         $this
             ->addOption('chat-id', 'c', InputOption::VALUE_OPTIONAL, 'ID of the chat')

src/Command/TelegramWebhookCommand.php

@@ -28,7 +28,7 @@ class TelegramWebhookCommand extends Command
         parent::__construct();
     }
 
-    protected function configure()
+    protected function configure(): void
     {
         $this
             ->addArgument('mode', InputArgument::REQUIRED, 'Command mode (set or delete)')

src/Command/UpdateSubscriptionsCommand.php

@@ -32,7 +32,7 @@ class UpdateSubscriptionsCommand extends Command
         parent::__construct();
     }
 
-    protected function configure()
+    protected function configure(): void
     {
         $this
             ->addOption(

src/Command/UpdateUsersPrivacyCommand.php

@@ -32,7 +32,7 @@ class UpdateUsersPrivacyCommand extends Command
         parent::__construct();
     }
 
-    protected function configure()
+    protected function configure(): void
     {
         $this
             ->addOption(