fix(package): update postcss-load-config to version 2.0.0

Author: greenkeeper[bot]

package.json

@@ -25,7 +25,7 @@
     "get-stdin": "^6.0.0",
     "globby": "^8.0.0",
     "postcss": "^6.0.1",
-    "postcss-load-config": "^1.1.0",
+    "postcss-load-config": "^2.0.0",
     "postcss-reporter": "^5.0.0",
     "pretty-hrtime": "^1.0.3",
     "read-cache": "^1.0.0",