Fixed tag name in installer of release 1.0.

install-labmanager.sh

 #!/bin/bash
 GIT_URL=https://gitlab.di.unipmn.it
-GIT_BASE_DIR=ulisse/labmanager-systemd/raw/1.0
+GIT_BASE_DIR=ulisse/labmanager-systemd/raw/v1.0
 
 function askYesNo {
     QUESTION=$1