fix version in package.xml

Author: jlblancoc

package.xml

@@ -7,7 +7,7 @@
 <package format="3">
   <name>mrpt2</name>
   <!-- Before updating version number, read [MRPT_ROOT]/version_prefix.txt first -->
-  <version>2.12.3</version>
+  <version>2.13.0</version>
   <description>Mobile Robot Programming Toolkit (MRPT) version 2.x</description>
 
   <author     email="[email protected]">Jose-Luis Blanco-Claraco</author>