feat: use standard (https://standardjs.com) for coding style guide

.travis.yml

@@ -2,10 +2,16 @@ language: node_js
 cache:
   directories:
     - node_modules
+notifications:
+  email:
+    recipients:
+      - github@josef-froehle.de
+    on_success: change
+    on_failure: change
 node_js:
-  - "4"
-  - "6"
-  - "8"
+  - '8'
+  - '6'
+  - '4'
 before_install:
   - npm install -g grunt-cli
 before_script:
@@ -17,10 +23,3 @@ after_success:
 branches:
   except:
     - /^v\d+\.\d+\.\d+$/
-notifications:
-  email:
-    recipients:
-      - github@josef-froehle.de
-    on_success: change
-    on_failure: change
-

Gruntfile.js

@@ -1,24 +1,27 @@
-'use strict';
+'use strict'
 
-module.exports = function(grunt) {
-    // Project configuration.
-    grunt.initConfig({
-        jshint: {
-            all: ['lib/*.js', 'test/*.js', 'Gruntfile.js'],
-            options: {
-                jshintrc: '.jshintrc'
-            }
-        },
+module.exports = function (grunt) {
+  // Project configuration.
+  grunt.initConfig({
+    standard: {
+      options: {
+        fix: true
+      },
+      app: {
+        src: [
+          '{,lib/,test/}*.js'
+        ]
+      }
+    },
+    nodeunit: {
+      all: 'test/pem.js'
+    }
+  })
 
-        nodeunit: {
-            all: 'test/pem.js'
-        }
-    });
+  // Load the plugin(s)
+  grunt.loadNpmTasks('grunt-standard')
+  grunt.loadNpmTasks('grunt-contrib-nodeunit')
 
-    // Load the plugin(s)
-    grunt.loadNpmTasks('grunt-contrib-jshint');
-    grunt.loadNpmTasks('grunt-contrib-nodeunit');
-
-    // Tasks
-    grunt.registerTask('default', ['jshint', 'nodeunit']);
-};
+  // Tasks
+  grunt.registerTask('default', ['standard', 'nodeunit'])
+}

README.md

@@ -7,6 +7,7 @@ Create private keys and certificates with node.js
 
 [![Build Status](https://secure.travis-ci.org/Dexus/pem.png)](http://travis-ci.org/Dexus/pem)
 [![npm version](https://badge.fury.io/js/pem.svg)](http://badge.fury.io/js/pem)
+[![JavaScript Style Guide](https://cdn.rawgit.com/standard/standard/master/badge.svg)](https://github.com/standard/standard)
 
 ## Installation