Update package.xml for ROS Noetic compatibility

package.xml

 <?xml version="1.0"?>
-<package format="2">
+<package format="3">
   <name>example-robot-data</name>
   <version>3.2.0</version>
   <description>Set of robot URDFs for benchmarking and developed examples.</description>
@@ -7,14 +7,16 @@
   Please check the repository URL for project maintainer. -->
   <author email="carlos.mastalli@ed.ac.uk">Carlos Mastalli</author>
   <maintainer email="guilhem.saurel@laas.fr">Guilhem Saurel</maintainer>
-  <maintainer email="wolfgang.merkt@ed.ac.uk">Wolfgang Merkt</maintainer>
+  <maintainer email="opensource@wolfgangmerkt.com">Wolfgang Merkt</maintainer>
   <license>BSD</license>
 
-  <url type="repository">https://gepgitlab.laas.fr/gepetto/example-robot-data.git</url>
+  <url type="repository">https://github.com/gepetto/example-robot-data</url>
 
   <build_depend>git</build_depend>
-  <depend>python</depend>
-  <depend>python-numpy</depend>
+  <depend condition="$ROS_PYTHON_VERSION == 2">python</depend>
+  <depend condition="$ROS_PYTHON_VERSION == 3">python3</depend>
+  <depend condition="$ROS_PYTHON_VERSION == 2">python-numpy</depend>
+  <depend condition="$ROS_PYTHON_VERSION == 3">python3-numpy</depend>
   <depend>boost</depend>
   <depend>pinocchio</depend>