Updating copyrights

New format: 'Copyright .year-present Open Networking Laboratory'

Change-Id: I1a9e58b355b775e75245ad875a2d7a4df3f03098
diff --git a/apps/acl/pom.xml b/apps/acl/pom.xml
index 4f859be..bc12d67 100644
--- a/apps/acl/pom.xml
+++ b/apps/acl/pom.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
-  ~ Copyright 2015-2016 Open Networking Laboratory
+  ~ Copyright 2015-present Open Networking Laboratory
   ~ Originally created by Pengfei Lu, Network and Cloud Computing Laboratory, Dalian University of Technology, China
   ~ Advisers: Keqiu Li and Heng Qi
   ~ This work is supported by the State Key Program of National Natural Science of China(Grant No. 61432002)