fixed rtabmap_msgs->rtabmap_conversions build dependency. Upgraded min cmake version to 3.5.

rtabmap_costmap_plugins/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8.3)
+cmake_minimum_required(VERSION 3.5)
 project(rtabmap_costmap_plugins)
 
 ##################

rtabmap_costmap_plugins/src/static_layer.cpp

@@ -263,4 +263,4 @@ void StaticLayer::updateCosts(costmap_2d::Costmap2D& master_grid, int min_i, int
     updateWithMax(master_grid, min_i, min_j, max_i, max_j);
 }
 
-}  // namespace rtabmap_ros
+}  // namespace rtabmap_costmap_plugins

rtabmap_costmap_plugins/src/voxel_layer.cpp

@@ -485,4 +485,4 @@ void VoxelLayer::updateOrigin(double new_origin_x, double new_origin_y)
   delete[] local_voxel_map;
 }
 
-}  // namespace rtabmap_ros
+}  // namespace rtabmap_costmap_plugins