init

bin/cli.js

@@ -19,7 +19,7 @@ program
 	.option('-v, --verbose [boolean]', 'verbose mode', false)
 	.parse(process.argv);
 
-if(!program.input || program.output){
+if(!program.input || !program.output){
 	console.warn('parameter is incorrect');
 	process.exit(1);
 }