fix: make postcss work again

Author: matteocng

postcss.config.js

@@ -0,0 +1,9 @@
+// Hopefully this configuration can go back soon into webpack.config.js.
+// SEE: https://github.com/postcss/postcss-loader/issues/92#issuecomment-267206639
+module.exports = {
+  plugins: {
+    'autoprefixer': {
+      browsers: ['last 4 versions']
+    },
+  },
+};