feat(gen-config): change '--gen-config' option to 'init' command

Author: isuke

lib/index.js

@@ -78,11 +78,19 @@ program
   .option('-i, --interactive', 'run interactive mode')
   .option('-S, --silent', "don't show commit command")
   .option('-t, --typo-check', '[Already deleted this function] check spell')
-  .option('--gen-config', 'generate config files')
   .version(version)
 
-if (process.argv.includes('--gen-config')) {
+program
+  .command('init')
+  .description('generate config files')
+  .option('-D, --dry-run', 'run dry-run mode')
+  .action(() => {
+    /* no-op */
+  })
+
+if (process.argv[2] === 'init') {
   program.parse(process.argv)
+
   genConfig(program, templateFileName, definitionsFileName)
 } else {
   const projectRoot = getProjectRoot()