Fix constructor of slack

src/Monolog/Handler/SlackHandler.php

@@ -63,8 +63,7 @@ class SlackHandler extends SocketHandler
             $iconEmoji,
             $useShortAttachment,
             $includeContextAndExtra,
-            $excludeFields,
-            $this->formatter
+            $excludeFields
         );
 
         $this->token = $token;

src/Monolog/Handler/SlackWebhookHandler.php

@@ -60,8 +60,7 @@ class SlackWebhookHandler extends AbstractProcessingHandler
             $iconEmoji,
             $useShortAttachment,
             $includeContextAndExtra,
-            $excludeFields,
-            $this->formatter
+            $excludeFields
         );
     }