cli: making --version output python version as well
cli: making --version output python version as well

rhaschke/catkin_tools,scpeters/catkin_tools,scpeters/catkin_tools,catkin/catkin_tools,rhaschke/catkin_tools,scpeters/catkin_tools,scpeters/catkin_tools,rhaschke/catkin_tools,catkin/catkin_tools,catkin/catkin_tools,catkin/catkin_tools