minor changes

setup.sh

@@ -1,13 +1,14 @@
 #!/bin/bash
 
 apt-get update
-apt-get install -y opam wget m4 unzip librsvg2-bin curl bubblewrap make gcc
+apt-get install opam wget m4 unzip librsvg2-bin curl bubblewrap make gcc
 
-opam init -y --bare
+opam init
+opam switch create 5.2.1
 eval $(opam env)
 
 opam remote add grew "https://opam.grew.fr"
-opam update
-opam install grewpy_backend -y
+opam install grew
 
+opam install grewpy_backend 
 pip install grewpy