Missing copywrite info

Author: amit-nayar

android/src/main/java/com/pspdfkit/flutter/pspdfkit/EventDispatcher.java

@@ -1,3 +1,12 @@
+///
+///  Copyright © 2021 PSPDFKit GmbH. All rights reserved.
+///
+///  THIS SOURCE CODE AND ANY ACCOMPANYING DOCUMENTATION ARE PROTECTED BY INTERNATIONAL COPYRIGHT LAW
+///  AND MAY NOT BE RESOLD OR REDISTRIBUTED. USAGE IS BOUND TO THE PSPDFKIT LICENSE AGREEMENT.
+///  UNAUTHORIZED REPRODUCTION OR DISTRIBUTION IS SUBJECT TO CIVIL AND CRIMINAL PENALTIES.
+///  This notice may not be removed from this file.
+///
+
 package com.pspdfkit.flutter.pspdfkit;
 
 import androidx.annotation.NonNull;
@@ -42,4 +51,4 @@ private void sendEvent(@NonNull final String method) {
             channel.invokeMethod(method, null, null);
         }
     }
-}
+}