chore: Update the NOTICE file

bruceg · bruceg · commit a984f1ea6c04 · 2023-05-17T16:46:20.000-06:00
diff --git a/NOTICE b/NOTICE
@@ -1,4 +1,8 @@
+Unless explicitly stated otherwise all files in this repository are licensed under the Mozilla
+Public License, version 2.0 (MPL-2.0).
 
+This product includes software developed at Datadog (https://www.datadoghq.com/)
+Copyright 2023 Datadog, Inc.
 
    Copyright (c) 2020 Vector Authors <vector@datadoghq.com>
 
