Update cli.py

backupill/cli.py

@@ -3,8 +3,8 @@ import click
 import backupill as bp
 
 
+@click.argument("file", required=True)
 @click.version_option(version=bp.__version__)
-@click.option("-f", "--file", help="ASC (.asc) file path.")
 @click.command(context_settings=dict(help_option_names=["-h", "--help"]))
 def main(file):
     """
@@ -15,13 +15,13 @@ def main(file):
 
     if file:
         if not os.path.isfile(file):
-            click.echo("File '{}' not found!".format(file))
+            click.echo("Error: File '{}' not found!".format(file))
             exit()
 
         bp.generate_backup(file)
         click.echo("Done!")
     else:
-        click.echo("Usage: packupill -f FILENAME.asc")
+        click.echo("Usage: packupill FILENAME.asc")
 
 
 if __name__ == "__main__":