feat(CLI): added help

lib/cli.js

@@ -2,11 +2,23 @@
 
 var fs = require('fs')
 var semicolonIndent = require('../')
-var pkg = require('../package.json')
+
+var help = function () {
+  /*
+  Usage:
+    semicolon-indent <options> -- <file>
+
+  Options:
+    -f, --force    Indent everything with semicolons
+    -v, --version  Output the current version
+    -h, --help     Output this help info
+  */
+}.toString().split(/\n/).slice(2, -2).join('\n')
 
 module.exports = function (argv) {
   process.stdin.setEncoding('utf8')
-  if (argv.version || argv.v) return console.log(pkg.version)
+  if (argv.version || argv.v) return console.log(require('../package.json').version)
+  if (argv.help || argv.h) return console.log(help)
   var fmode = argv.force || argv.f
   var inputFile = argv._.shift()
   if (fs.existsSync(inputFile) && fs.statSync(inputFile).isFile()) {