Update utils/pull_subtrees.sh

utils/pull_subtrees.sh

@@ -17,7 +17,7 @@ cd ..
 
 # Vitis
 echo "---- Pull vitis ----"
-git subtree pull --prefix src/vitis "git@gitlab.veremes.net:Development/vitis_apps/sources/vitis.git" master
+git subtree pull --prefix src/vitis --squash -m "pull from module"  "git@gitlab.veremes.net:Development/vitis_apps/sources/vitis.git" master
 
 # Modules
 if [[ $depsCount > 0 ]]; then