update script

piplotter

@@ -1,10 +1,10 @@
 #!/usr/bin/env python3
 
-import os
+import os, sys
 import piplot.main
 
 if __name__ == "__main__":
     if os.getuid() != 0:
         print("You need root permissions to do this ...")
-        exit(1)
+        sys.exit(1)
     piplot.main.main()