bug fix

sa828.py

@@ -138,8 +138,8 @@ def main():
 
   opts = parser.parse_args()
   if not hasattr(opts, 'func'):
-    print('sa818: error: the following arguments are required: {radio,volume,filters,version}\n'
-          'use --help for more informatiion',
+    print('sa818: error: the following arguments are required: {version,reset,readparameter,setparameter}\n'
+          'use --help for more information',
           file=sys.stderr)
     sys.exit(os.EX_USAGE)