Escape HTML tags in action element to avoid XML parser error in change report plugin 2.1 (was OK in 2.0)

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/codec/trunk@794354 13f79535-47bb-0310-9956-ffa450edef68

Author: garydgregory

xdocs/changes.xml

@@ -101,8 +101,9 @@
       	    </action>
 			<action dev="ggregory" type="update">
           	This version is relesed under the 
-          	<a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License 2.0</a>
-          	, please see LICENSE.txt. Previous versions were released under the Apache License 1.1.
+          	&lt;a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License 2.0&lt;/a>
+          	, please see LICENSE.txt. Previous versions were released under the 
+          	&lt;a href="http://www.apache.org/licenses/LICENSE-1.1">Apache License 1.1&lt;/a>
       	    </action>
 			<action dev="ggregory" type="update">
       	    The Board recommendation to remove Javadoc author tags has been