Update AgentLogger.h (#110)

Author: kpratyus

instrumentation/otel-webserver-module/include/core/AgentLogger.h

@@ -1,6 +1,17 @@
 /*
-   Copyright 2020 AppDynamics.
-   All rights reserved.
+* Copyright 2021 AppDynamics LLC. 
+*
+* 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 the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* 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.
 */