message: Update rtabmap.launch
  removed voxel_size in points_xyzrgb nodelet to avoid "Leaf size is too small" pcl warnings when stereo cameras are used.
diff: <remap from="cloud" to="voxel_cloud" />
  <param name="decimation" type="double" value="2"/>
  - <param name="voxel_size" type="double" value="0.02"/>
  + <param name="voxel_size" type="double" value="0.0"/>
  <param name="approx_sync" type="bool" value="$(arg approx_sync)"/>
  </node>
  