Fix deprecation warning in paramater declaration (ros-controls#582)

Author: kumar-sanjeeev

example_1/bringup/config/rrbot_forward_position_publisher.yaml

@@ -6,6 +6,6 @@ publisher_forward_position_controller:
 
     goal_names: ["pos1", "pos2", "pos3", "pos4"]
     pos1: [0.785, 0.785]
-    pos2: [0, 0]
+    pos2: [0.0, 0.0]
     pos3: [-0.785, -0.785]
-    pos4: [0, 0]
+    pos4: [0.0, 0.0]