[package.xml] update maintainer, fix #86

Author: nim65s

package.xml

@@ -5,15 +5,14 @@
   <description>
     Pinocchio bindings for dynamic-graph
   </description>
-  <maintainer email="ostasse@laas.fr">Olivier Stasse</maintainer>
+  <maintainer email="guilhem.saurel@laas.fr">Guilhem Saurel</maintainer>
 
   <license>BSD</license>
 
   <url type="website">http://stack-of-tasks.github.io</url>
   <url type="repository">http://www.github.com/stack-of-tasks/sot-dynamic-pinocchio</url>
   <url type="bugtracker">http://www.github.com/stack-of-tasks/sot-dynamic-pinocchio/issues</url>
   <author>Olivier Stasse</author>
-  <author email="[email protected]">[email protected]</author>
 
   <build_depend>git</build_depend>
   <build_depend>doxygen</build_depend>