updating rosinstall URI

README.md

@@ -31,7 +31,7 @@ For permanently maintaining the overlay, source the setup.bash file at the end o
 
 ```bash
 $ cd ~/idress_ws/src
-$ wstool merge idress-minimal.rosinstall
+$ wstool merge https://gitlab.iri.upc.edu/idress/code_installation_steps/raw/master/idress-minimal.rosinstall
 $ wstool update
 ```