Remove stylelint

This development dependency was resulting in normalize.css being marked
as containing a potential security vulnerability.

CONTRIBUTING.md

@@ -119,12 +119,6 @@ project:
    [interactive rebase](https://help.github.com/articles/interactive-rebase)
    feature to tidy up your commits before making them public.
 
-   Be sure to test the `normalize.css` file for style conformance.
-
-   ```bash
-   npm test
-   ```
-
    Be sure to add a test to the `test.html` file if appropriate, and test
    your change in all supported browsers.
 

package.json

@@ -8,28 +8,8 @@
     "LICENSE.md",
     "normalize.css"
   ],
-  "devDependencies": {
-    "stylelint": "^7.9.0",
-    "stylelint-config-standard": "^16.0.0"
-  },
-  "scripts": {
-    "test": "stylelint normalize.css"
-  },
   "repository": "necolas/normalize.css",
   "license": "MIT",
   "bugs": "https://github.com/necolas/normalize.css/issues",
-  "homepage": "https://necolas.github.io/normalize.css",
-  "stylelint": {
-    "extends": "stylelint-config-standard",
-    "rules": {
-      "font-family-no-duplicate-names": [
-        true,
-        {
-          "ignoreFontFamilyNames": [
-            "monospace"
-          ]
-        }
-      ]
-    }
-  }
+  "homepage": "https://necolas.github.io/normalize.css"
 }