chore(package): update postcss-reporter to version 4.0.0

Author: greenkeeper[bot]

package.json

@@ -56,6 +56,6 @@
     "eslint-plugin-standard": "^3.0.1",
     "jest-cli": "^20.0.0",
     "opn-cli": "^3.0.0",
-    "postcss-reporter": "^3.0.0"
+    "postcss-reporter": "^4.0.0"
   }
 }