Move preflight CSS into plugins directory

package.json

@@ -18,7 +18,7 @@
   ],
   "scripts": {
     "prebabelify": "rimraf lib",
-    "babelify": "babel src --out-dir lib",
+    "babelify": "babel src --out-dir lib --copy-files",
     "prepare": "npm run babelify && babel-node src/build.js",
     "style": "eslint .",
     "test": "jest && eslint ."

src/plugins/preflight.js

@@ -3,9 +3,7 @@ import postcss from 'postcss'
 
 export default function() {
   return function({ addBase }) {
-    const preflightStyles = postcss.parse(
-      fs.readFileSync(`${__dirname}/../../css/preflight.css`, 'utf8')
-    )
+    const preflightStyles = postcss.parse(fs.readFileSync(`${__dirname}/css/preflight.css`, 'utf8'))
     addBase(preflightStyles.nodes)
   }
 }