【bugfix】output render foramt error while flag instance using inject

[alanchenchen]

example：

const { flag, output } = require('@alanchenchen/commandlineflag');
const program = flag();
const doc = output();

program
 .option('-c | --config', 'set config source path', ({ index, param}, args) => {
 console.log('index', index);
 console.log('param', param);
 console.log('args', args);
 })
 .option('-h | --help', () => {
 doc.render(true);
 })
 .version(require('../package').version)
 .run();

next, input command in terminal

$ ssh-deploy -h

 Usage: flag <command> [options]

 ssh-deploy CLI

 Options:

 -V, --version output the version number
 -h, --help output usage information
 -c | --config set config file path

option '-c | --config' is not good, it should be '-c , --config'.