Merge remote-tracking branch 'origin/greenkeeper-postcss-6.0.1' into milestone-0.1.1

Author: Scrum

package.json

@@ -47,7 +47,7 @@
     "property"
   ],
   "dependencies": {
-    "postcss": "^5.2.10"
+    "postcss": "^6.0.1"
   },
   "devDependencies": {
     "ava": "0.19.1",