acknowledge Lightbend in LICENSE

Delete NOTICE

LICENSE

@@ -1,6 +1,6 @@
 This software is licensed under the Apache 2 license, quoted below.
 
-Copyright © 2013-2014 the kamon project <http://kamon.io>
+Copyright © 2013-2024 the kamon project <http://kamon.io>
 
 Licensed under the Apache License, Version 2.0 (the "License"); you may not
 use this file except in compliance with the License. You may obtain a copy of
@@ -12,4 +12,12 @@ Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 License for the specific language governing permissions and limitations under
-the License.
+the License.
+
+------------------------------------------------------------------------
+
+The kamon-akka and kamon-pekko modules and other modules prefixed
+with "kamon-akka" and "kamon-pekko" contain code from the Akka project
+<https://akka.io/> which is licensed under the Apache License, Version 2.0.
+This code is from before Akka changed to the Business Source License 1.1.
+Copyright (C) 2009-2022 Lightbend Inc. <https://www.lightbend.com>