chore(package): update postcss-nested to version 4.1.1

Author: greenkeeper[bot]

package.json

@@ -26,7 +26,7 @@
     "postcss-easy-import": "3.0.0",
     "postcss-flexbugs-fixes": "4.1.0",
     "postcss-mixins": "6.2.1",
-    "postcss-nested": "4.1.0",
+    "postcss-nested": "4.1.1",
     "postcss-normalize": "7.0.1",
     "postcss-preset-env": "6.5.0",
     "postcss-utilities": "0.8.0"