log the error instead of printing it

scripts/pype9

@@ -13,6 +13,7 @@ import sys
 from copy import copy
 from argparse import ArgumentParser
 import pype9.cmd
+from pype9.utils.logging import logger
 
 parser = ArgumentParser(__doc__)
 parser.add_argument('cmd', choices=pype9.cmd.help.all_cmds(),
@@ -26,6 +27,6 @@ del sys.argv[1:]
 try:
     getattr(pype9.cmd, args.cmd).run(argv)
 except Pype9UsageError as e:
-    print(e)  # Prettier error messages than the full stack trace
+    logger.error(e)
     sys.exit(1)  # Signal an error to the calling shell