chore: upgrade standardization and configure markdownlint

.markdownlint.json

@@ -0,0 +1,3 @@
+{
+   "extends": "./node_modules/@silvermine/standardization/.markdownlint.json"
+}

Gruntfile.js

@@ -6,7 +6,8 @@
 'use strict';
 
 var path = require('path'),
-    getCodeVersion = require('silvermine-serverless-utils/src/get-code-version');
+    getCodeVersion = require('silvermine-serverless-utils/src/get-code-version'),
+    markdownlint = require('markdownlint');
 
 const sass = require('node-sass');
 
@@ -137,6 +138,17 @@ module.exports = function(grunt) {
          },
       },
 
+      markdownlint: {
+         all: {
+            // Adjust `src` depending on how many files need to be linted:
+            src: [ 'README.md' ],
+            options: {
+               // eslint-disable-next-line no-sync
+               config: markdownlint.readConfigSync('.markdownlint.json'),
+            },
+         },
+      },
+
    });
 
    grunt.loadNpmTasks('grunt-contrib-uglify');
@@ -147,8 +159,9 @@ module.exports = function(grunt) {
    grunt.loadNpmTasks('grunt-contrib-clean');
    grunt.loadNpmTasks('grunt-sass');
    grunt.loadNpmTasks('grunt-stylelint');
+   grunt.loadNpmTasks('grunt-markdownlint');
 
-   grunt.registerTask('standards', [ 'eslint', 'stylelint' ]);
+   grunt.registerTask('standards', [ 'eslint', 'stylelint', 'markdownlint' ]);
    grunt.registerTask('build-js', [ 'browserify', 'uglify' ]);
    grunt.registerTask('build-css', [ 'sass', 'postcss' ]);
    grunt.registerTask('build', [ 'build-js', 'build-css' ]);

README.md

@@ -31,14 +31,14 @@ for `videojs` at `window.videojs`).
 There is an example of this in
 [`docs/demo/index.html`](./docs/demo/index.html).
 
-##### From local file:
+##### From local file
 
 ```js
 <script src="./path/to/video.min.js"></script>
 <script src="./path/to/silvermine-videojs-quality-selector.min.js"></script>
 ```
 
-##### From [`unpkg`](https://unpkg.com/@silvermine/videojs-quality-selector/):
+##### From [`unpkg`](https://unpkg.com/@silvermine/videojs-quality-selector/)
 
 ```js
 <link href="https://unpkg.com/@silvermine/videojs-quality-selector/dist/css/quality-selector.css" rel="stylesheet">
@@ -50,7 +50,7 @@ There is an example of this in
 
 When using NPM/Browserify, first install the plugin.
 
-```
+```bash
 npm install --save @silvermine/videojs-quality-selector
 ```
 
@@ -113,13 +113,13 @@ player.src([
 There are at least two ways to add the quality selector control to the player's control
 bar. The first is directly adding it via `addChild`. For example:
 
-```
+```js
 player.controlBar.addChild('QualitySelector');
 ```
 
 The second option is to add the control via the player's options, for instance:
 
-```
+```js
 var options, player;
 
 options = {

package.json

@@ -27,7 +27,7 @@
   "homepage": "https://github.com/silvermine/videojs-quality-selector#readme",
   "devDependencies": {
     "@silvermine/eslint-config": "3.0.1",
-    "@silvermine/standardization": "1.1.0",
+    "@silvermine/standardization": "1.2.0",
     "autoprefixer": "8.6.5",
     "check-node-version": "4.0.3",
     "coveralls": "3.0.3",