move author tags below to comply with the xsd

Signed-off-by: Mikael Arguedas <[email protected]>

package.xml

@@ -5,15 +5,15 @@
   <version>0.7.0</version>
   <description>This package contains generic definitions of geometric shapes and bodies.</description>
 
-  <author email="[email protected]">Ioan Sucan</author>
-  <author email="[email protected]">Gil Jones</author>
-
   <maintainer email="[email protected]">Dave Coleman</maintainer>
   <maintainer email="[email protected]">Isaac I. Y. Saito</maintainer>
 
   <license>BSD</license>
   <url>http://ros.org/wiki/geometric_shapes</url>
 
+  <author email="[email protected]">Ioan Sucan</author>
+  <author email="[email protected]">Gil Jones</author>
+
   <buildtool_depend>ament_cmake</buildtool_depend>
   <buildtool_depend>rosidl_default_generators</buildtool_depend>