message: Update README.md
  removed extra instructions to clean up rtabmap on update as version problem has been fixed in
diff: @@ -96,24 +96,9 @@ This section shows how to install RTAB-Map ros-pkg on **ROS Hydro/Indigo/Jade/Ki
  ###########
  # rtabmap
  ###########
  -$ cd rtabmap/build
  -# We want to do a clean re-install to avoid problems if RTAB-Map's minor version has changed.
  -
  -# If previously installed in ~/catkin_ws/devel:
  -$ make uninstall
  -# If previously installed in /usr/local:
  -$ sudo make uninstall
  -
  -$ cd ..
  -$ rm -rf build/*
  +$ cd rtabmap
  $ git pull origin master
  $ cd build
  -
  -# To install in catkin_ws:
  -$ cmake -DCMAKE_INSTALL_PREFIX=~/catkin_ws/devel ..
  -# Or this to install in /usr/local:
  -$ cmake ..
  -
  $ make
  $ make install
  # Do "sudo make install" if you installed rtabmap in "/usr/local"
  @@ -123,9 +108,8 @@ $ make install
  ###########
  $ roscd rtabmap_ros
  $ git pull origin master
  -$ cd ~/catkin_ws
  -# reset cmake cache
  -$ rm -rf build/CMakeCache.txt build/rtabmap_ros
  +$ roscd
  +$ cd ..
  $ catkin_make -j1 --pkg rtabmap_ros
  ```
  