style: prettier for formatting JSON, MD, JS and TS files (dequelabs#1229

)

This PR does the below:
- Put `prettier` to work for `json, md, js, ts` files.
- Remove usage of `grunt-markdownlint`.

Main changes are here - https://github.com/dequelabs/axe-core/compare/prettier-update?expand=1#diff-b9cfc7f2cdf78a7f4b91a753d10865a2R68

Closes issue: NA

## Reviewer checks

**Required fields, to be filled out by PR reviewer(s)**
- [x] Follows the commit message policy, appropriate for next version
- [x] Has documentation updated, a DU ticket, or requires no documentation change
- [x] Includes new tests, or was unnecessary
- [x] Code is reviewed for security by: @WilcoFiers

.prettierignore

@@ -0,0 +1 @@
+node_modules/

CONTRIBUTING.md

@@ -42,7 +42,7 @@ We expect all code to be 100% covered by tests. We don't have or want code cover
 
 Functions should contain a preceding comment block with [jsdoc](http://usejsdoc.org/) style documentation of the function. For example:
 
-```javascript
+```js
 /**
  * Runs the Audit; which in turn should call `run` on each rule.
  * @async
@@ -54,7 +54,7 @@ Functions should contain a preceding comment block with [jsdoc](http://usejsdoc.
 
 Classes should contain a jsdoc comment block for each attribute. For example:
 
-```javascript
+```js
 /**
  * Constructor for the result of checks
  * @param {Object} check CheckResult specification
@@ -132,19 +132,19 @@ tsc --noImplicitAny typings/axe-core/axe-core-tests.ts
 
 Installing aXe to run accessibility tests in your TypeScript project should be as simple as importing the module:
 
-```javascript
+```js
 import * as axe from 'axe-core';
 
 describe('Module', () => {
-	it('should have no accessibility violations', (done) => {
-		axe.run(compiledFixture)
-			.then((results) => {
-				expect(results.violations.length).toBe(0);
-				done()
-			}, done);
+	it('should have no accessibility violations', done => {
+		axe.run(compiledFixture).then(results => {
+			expect(results.violations.length).toBe(0);
+			done();
+		}, done);
 	});
 });
 ```
+
 ## Debugging tests that only fail on CircleCI
 
 First install an X-Windows client on your machine. XQuartz is a good one.

Gruntfile.js

@@ -17,7 +17,6 @@ module.exports = function(grunt) {
 	grunt.loadNpmTasks('grunt-contrib-watch');
 	grunt.loadNpmTasks('grunt-mocha');
 	grunt.loadNpmTasks('grunt-parallel');
-	grunt.loadNpmTasks('grunt-markdownlint');
 	grunt.loadNpmTasks('grunt-run');
 	grunt.loadTasks('build/tasks');
 
@@ -345,14 +344,6 @@ module.exports = function(grunt) {
 				cmd: 'npm',
 				args: ['run', 'eslint']
 			}
-		},
-		markdownlint: {
-			all: {
-				options: {
-					config: grunt.file.readJSON('.markdownlint.json')
-				},
-				src: ['README.md', '.github/*.md', 'doc/**/*.md']
-			}
 		}
 	});
 
@@ -382,8 +373,7 @@ module.exports = function(grunt) {
 		'fixture',
 		'connect',
 		'mocha',
-		'parallel',
-		'markdownlint'
+		'parallel'
 	]);
 
 	grunt.registerTask('ci-build', [

README.md

@@ -49,8 +49,8 @@ npm install axe-core --save-dev
 
 Now include the javascript file in each of your iframes in your fixtures or test systems:
 
-```html
-<script src="node_modules/axe-core/axe.min.js" ></script>
+```
+<script src="node_modules/axe-core/axe.min.js"></script>
 ```
 
 Now insert calls at each point in your tests where a new piece of UI becomes visible or exposed:
@@ -68,11 +68,11 @@ axe.run(function (err, results) {
 
 The [aXe API](doc/API.md) fully supports the following browsers:
 
-* Microsoft Edge v40 and above
-* Google Chrome v42 and above
-* Mozilla Firefox v38 and above
-* Apple Safari v7 and above
-* Internet Explorer v9, 10, 11
+- Microsoft Edge v40 and above
+- Google Chrome v42 and above
+- Mozilla Firefox v38 and above
+- Apple Safari v7 and above
+- Internet Explorer v9, 10, 11
 
 Support means that we will fix bugs and attempt to test each browser regularly. Only Firefox and Chrome are currently tested on every pull request.
 
@@ -86,8 +86,8 @@ The complete list of rules run by axe-core can be found in [doc/rule-description
 
 The [aXe API](doc/API.md) package consists of:
 
-* `axe.js` - the JavaScript file that should be included in your web site under test (API)
-* `axe.min.js` - a minified version of the above file
+- `axe.js` - the JavaScript file that should be included in your web site under test (API)
+- `axe.min.js` - a minified version of the above file
 
 ## Localization
 
@@ -105,26 +105,27 @@ Additionally, locale can be applied at runtime by passing a `locale` object to `
 
 ```js
 axe.configure({
-  locale: {
-    lang: 'de',
-    rules: {
-      accesskeys: {
-        help: 'Der Wert des accesskey-Attributes muss einzigartig sein.'
-      },
-      // ...
-    },
-    checks: {
-      abstractrole: {
-        fail: 'Abstrakte ARIA-Rollen dürfen nicht direkt verwendet werden.'
-      },
-      'aria-errormessage': {
-        // Note: doT (https://github.com/olado/dot) templates are supported here.
-        fail: 'Der Wert der aria-errormessage {{~it.data:value}} `{{=value}}{{~}}` muss eine Technik verwenden, um die Message anzukündigen (z. B., aria-live, aria-describedby, role=alert, etc.).'
-      }
-      // ...
-    }
-  }
-})
+	locale: {
+		lang: 'de',
+		rules: {
+			accesskeys: {
+				help: 'Der Wert des accesskey-Attributes muss einzigartig sein.'
+			}
+			// ...
+		},
+		checks: {
+			abstractrole: {
+				fail: 'Abstrakte ARIA-Rollen dürfen nicht direkt verwendet werden.'
+			},
+			'aria-errormessage': {
+				// Note: doT (https://github.com/olado/dot) templates are supported here.
+				fail:
+					'Der Wert der aria-errormessage {{~it.data:value}} `{{=value}}{{~}}` muss eine Technik verwenden, um die Message anzukündigen (z. B., aria-live, aria-describedby, role=alert, etc.).'
+			}
+			// ...
+		}
+	}
+});
 ```
 
 ## Supported ARIA Roles and Attributes.

bower.json

@@ -1,46 +1,40 @@
 {
-  "name": "axe-core",
-  "version": "3.1.2",
-  "contributors": [
-    {
-      "name": "David Sturley",
-      "organization": "Deque Systems, Inc.",
-      "url": "http://deque.com/"
-    },
-    {
-      "name": "Dylan Barrell",
-      "organization": "Deque Systems, Inc.",
-      "url": "http://deque.com/"
-    },
-    {
-      "name": "Wilco Fiers",
-      "organization": "Deque Systems, Inc.",
-      "url": "http://deque.com/"
-    },
-    {
-      "name": "Dian Fay",
-      "organization": "Deque Systems, Inc.",
-      "url": "http://deque.com/"
-    },
-    {
-      "name": "Marcy Sutton",
-      "organization": "Deque Systems, Inc.",
-      "url": "http://deque.com/"
-    }
-  ],
-  "repository": {
-    "type": "git",
-    "url": "https://github.com/dequelabs/axe-core.git"
-  },
-  "main": "axe.js",
-  "typings": "axe.d.ts",
-  "license": "MPL-2.0",
-  "ignore": [
-    "**/.*",
-    "node_modules",
-    "test",
-    "build",
-    "typings"
-  ],
-  "devDependencies": {}
+	"name": "axe-core",
+	"version": "3.1.2",
+	"contributors": [
+		{
+			"name": "David Sturley",
+			"organization": "Deque Systems, Inc.",
+			"url": "http://deque.com/"
+		},
+		{
+			"name": "Dylan Barrell",
+			"organization": "Deque Systems, Inc.",
+			"url": "http://deque.com/"
+		},
+		{
+			"name": "Wilco Fiers",
+			"organization": "Deque Systems, Inc.",
+			"url": "http://deque.com/"
+		},
+		{
+			"name": "Dian Fay",
+			"organization": "Deque Systems, Inc.",
+			"url": "http://deque.com/"
+		},
+		{
+			"name": "Marcy Sutton",
+			"organization": "Deque Systems, Inc.",
+			"url": "http://deque.com/"
+		}
+	],
+	"repository": {
+		"type": "git",
+		"url": "https://github.com/dequelabs/axe-core.git"
+	},
+	"main": "axe.js",
+	"typings": "axe.d.ts",
+	"license": "MPL-2.0",
+	"ignore": ["**/.*", "node_modules", "test", "build", "typings"],
+	"devDependencies": {}
 }

build/tasks/test-webdriver.js

@@ -85,8 +85,8 @@ module.exports = function(grunt) {
 	}
 
 	/*
-	* Build web driver depends whether REMOTE_SELENIUM_URL is set
-	*/
+	 * Build web driver depends whether REMOTE_SELENIUM_URL is set
+	 */
 	function buildWebDriver(browser) {
 		var webdriver, capabilities;
 		var mobileBrowser = browser.split('-mobile');