Update gradle to version 6.1.1

Use markdown version of the LGPL
Delete obsolete pom.xml

Change-Id: I7f141e2c3f50b9d97af99724f5ffc994a83d569e
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 09f6b42..1b16c34 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,20 +1,5 @@
-#
-# jndn-mock
-# Copyright (c) 2016, Intel Corporation.
-#
-# This program is free software; you can redistribute it and/or modify it
-# under the terms and conditions of the GNU Lesser General Public License,
-# version 3, as published by the Free Software Foundation.
-#
-# This program is distributed in the hope it will be useful, but WITHOUT ANY
-# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
-# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for
-# more details.
-#
-
-#Sun Jan 31 16:45:16 PST 2016
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.1.1-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.8.1-all.zip