Update playground dependencies

Author: MadLittleMods

.eslintignore

@@ -0,0 +1,3 @@
+playground/node_modules
+playground/jspm_packages
+playground/build.js

.eslintrc

@@ -0,0 +1,21 @@
+{
+	"env": {
+		"es6": true,
+		"node": true,
+		"browser": true,
+	},
+	"parserOptions": {
+		"ecmaVersion": 6,
+		"sourceType": "module",
+		"ecmaFeatures": {
+	    "jsx": true
+	  },
+	},
+	"extends": "eslint:recommended",
+	"plugins": [
+    "react"
+  ],
+	"rules": {
+
+	}
+}

package.json

@@ -23,12 +23,15 @@
     "chai": "^4.1.1",
     "chai-as-promised": "^7.1.1",
     "clean-css": "^4.1.7",
+    "eslint": "^4.4.1",
+    "eslint-plugin-react": "^7.1.0",
     "gulp": "^3.8.11",
     "gulp-eslint": "^4.0.0",
     "gulp-mocha": "^4.3.1",
     "mocha": "^3.5.0"
   },
   "scripts": {
-    "test": "gulp"
+    "test": "gulp",
+    "lint": "eslint ."
   }
 }

playground/.eslintignore

@@ -0,0 +1,3 @@
+node_modules
+jspm_packages
+build.js

playground/.jshintrc

@@ -0,0 +1 @@
+package-lock=false

playground/.npmrc

@@ -6,12 +6,6 @@ The code playground for `postcss-css-variables` is [available live here](https:/
 
 # Build
 
-## Prerequisites
-
- - [io.js](https://iojs.org/en/index.html) *or Node.js with support for template strings (not currently available)*
-
- ## Instructions:
-
 Run once to set everything up:
 
 `npm install`