chore(package): update postcss-reporter to version 6.0.0

Closes #8

Author: greenkeeper[bot]

package.json

@@ -34,7 +34,7 @@
     "postcss-cli": "^4.0.0",
     "postcss-cssnext": "^2.11.0",
     "postcss-import": "^10.0.0",
-    "postcss-reporter": "^3.0.0",
+    "postcss-reporter": "^6.0.0",
     "stylelint": "^7.10.0"
   },
   "scripts": {