suppress error when no command specified (#30)

yargs will show the help by default when no command is specified.
The error message makes to think that it is a bug in support tool.

Author: helio-frota

lib/cli/index.js

@@ -18,7 +18,6 @@ module.exports = (options = {}) => {
       });
     },
     fail: (msg) => {
-      log.error(msg);
       console.log();
       cli.showHelp();
       process.exit(1);