lint changes

packages/stream_chat_flutter/lib/src/message_action.dart

@@ -3,6 +3,13 @@ import 'package:stream_chat_flutter/stream_chat_flutter.dart';
 
 /// Class describing a message action
 class MessageAction {
+  /// returns a new instance of a [MessageAction]
+  MessageAction({
+    this.leading,
+    this.title,
+    this.onTap,
+  });
+
   /// leading widget
   final Widget? leading;
 
@@ -11,11 +18,4 @@ class MessageAction {
 
   /// callback called on tap
   final OnMessageTap? onTap;
-
-  /// returns a new instance of a [MessageAction]
-  MessageAction({
-    this.leading,
-    this.title,
-    this.onTap,
-  });
 }