chore: update dev dependencies and fix code style

Gruntfile.js

@@ -64,8 +64,7 @@ module.exports = function (grunt) {
 
     jshint: {
       options: {
-        jshintrc: '.jshintrc',
-        reporterOutput: ''
+        jshintrc: '.jshintrc'
       },
       files: [
         'Gruntfile.js',
@@ -76,7 +75,7 @@ module.exports = function (grunt) {
 
     eslint: {
       options: {
-        config: '.eslintrc.json'
+        useEslintrc: true
       },
       target: [
         'Gruntfile.js',

package.json

@@ -47,12 +47,12 @@
     "grunt": "^1.0.3",
     "grunt-contrib-clean": "1.1.x",
     "grunt-contrib-concat": "1.0.x",
-    "grunt-contrib-jshint": "1.1.x",
+    "grunt-contrib-jshint": "3.2.x",
     "grunt-contrib-uglify": "~3.3.0",
     "grunt-conventional-changelog": "6.1.x",
     "grunt-conventional-github-releaser": "1.0.x",
     "grunt-endline": "0.6.x",
-    "grunt-eslint": "19.0.x",
+    "grunt-eslint": "^24.0.0",
     "grunt-simple-mocha": "0.4.x",
     "load-grunt-tasks": "3.5.x",
     "performance-now": "2.0.x",

src/helpers.js

@@ -477,7 +477,7 @@ showdown.helper.Event = function (name, text, params) {
  * POLYFILLS
  */
 // use this instead of builtin is undefined for IE8 compatibility
-if (typeof(console) === 'undefined') {
+if (typeof (console) === 'undefined') {
   console = {
     warn: function (msg) {
       'use strict';

src/subParsers/makehtml/codeSpans.js

@@ -28,7 +28,7 @@ showdown.subParser('makehtml.codeSpans', function (text, options, globals) {
 
   text = globals.converter._dispatch('makehtml.codeSpans.before', text, options, globals).getText();
 
-  if (typeof(text) === 'undefined') {
+  if (typeof (text) === 'undefined') {
     text = '';
   }
   text = text.replace(/(^|[^\\])(`+)([^\r]*?[^`])\2(?!`)/gm,