Move license header to the top

Author: acogoluegnes

src/main/java/com/rabbitmq/client/impl/MicrometerMetricsCollector.java

@@ -1,3 +1,18 @@
+// Copyright (c) 2007-Present Pivotal Software, Inc.  All rights reserved.
+//
+// This software, the RabbitMQ Java client library, is triple-licensed under the
+// Mozilla Public License 1.1 ("MPL"), the GNU General Public License version 2
+// ("GPL") and the Apache License version 2 ("ASL"). For the MPL, please see
+// LICENSE-MPL-RabbitMQ. For the GPL, please see LICENSE-GPL2.  For the ASL,
+// please see LICENSE-APACHE2.
+//
+// This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND,
+// either express or implied. See the LICENSE file for specific language governing
+// rights and limitations of this software.
+//
+// If you have any questions regarding licensing, please contact us at
+// info@rabbitmq.com.
+
 package com.rabbitmq.client.impl;
 
 import com.rabbitmq.client.Channel;
@@ -16,21 +31,6 @@
 import static com.rabbitmq.client.impl.MicrometerMetricsCollector.Metrics.PUBLISHED_MESSAGES;
 import static com.rabbitmq.client.impl.MicrometerMetricsCollector.Metrics.REJECTED_MESSAGES;
 
-// Copyright (c) 2007-Present Pivotal Software, Inc.  All rights reserved.
-//
-// This software, the RabbitMQ Java client library, is triple-licensed under the
-// Mozilla Public License 1.1 ("MPL"), the GNU General Public License version 2
-// ("GPL") and the Apache License version 2 ("ASL"). For the MPL, please see
-// LICENSE-MPL-RabbitMQ. For the GPL, please see LICENSE-GPL2.  For the ASL,
-// please see LICENSE-APACHE2.
-//
-// This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND,
-// either express or implied. See the LICENSE file for specific language governing
-// rights and limitations of this software.
-//
-// If you have any questions regarding licensing, please contact us at
-// info@rabbitmq.com.
-
 /**
  * Micrometer implementation of {@link MetricsCollector}.
  * Note transactions are not supported (see {@link MetricsCollector}.