loaders should be an array

Just a little typo, thanks!

Author: shama

README.md

@@ -20,11 +20,11 @@ This webpack config can load css files, embed small png images as Data Urls and
 ``` javascript
 module.exports = {
   module: {
-    loaders: {
+    loaders: [
       { test: /\.css/, loader: "style-loader!css-loader" },
       { test: /\.png/, loader: "url-loader?limit=100000&minetype=image/png" },
       { test: /\.jpg/, loader: "file-loader" }
-    }
+    ]
   }
 };
 ```