Make -s and -p mutually exclusive

netrun.py

@@ -35,13 +35,14 @@ parser = argparse.ArgumentParser(
     description="Securely run a script from the Internet"
 )
 parser.add_argument("url", help="URL of the script")
-parser.add_argument(
+group = parser.add_mutually_exclusive_group()
+group.add_argument(
     "-s",
     "--skip-pager",
     action="store_true",
     help="Skip pager and confirmation; run script immediately",
 )
-parser.add_argument(
+group.add_argument(
     "-p",
     "--pager",
     help="Choose pager to use (default: `less`)",