Fix exit with help

Author: rtfpessoa

package.json

@@ -1,6 +1,6 @@
 {
   "name": "diff2html-cli",
-  "version": "1.4.0",
+  "version": "1.4.1",
   "homepage": "https://www.github.com/rtfpessoa/diff2html-cli",
   "description": "Fast Diff to colorized HTML",
   "keywords": [

src/main.js

@@ -11,8 +11,9 @@ var cli = require('./cli.js').Diff2HtmlInterface;
 var log = require('./logger.js').Logger;
 var utils = require('./utils.js').Utils;
 
-var argv = require('yargs')
-  .usage('Usage: diff2html [options] -- [diff args]')
+var yargs = require('yargs');
+
+var argv = yargs.usage('Usage: diff2html [options] -- [diff args]')
   .options({
     's': {
       alias: 'style',
@@ -138,7 +139,7 @@ function onInput(err, input) {
 
   if (!input) {
     log.error('The input is empty. Try again.');
-    argv.help();
+    yargs.showHelp("log");
   }
 
   if (argv.diffy) {