Bump reporter version to 2 (#63)

Author: danalloway

packages/preprocessor/package.json

@@ -30,7 +30,7 @@
     "postcss-custom-media": "^5.0.0",
     "postcss-custom-properties": "^5.0.0",
     "postcss-easy-import": "^1.0.1",
-    "postcss-reporter": "^1.3.0",
+    "postcss-reporter": "^2.0.0",
     "read-file-stdin": "^0.2.1",
     "stylelint": "^7.2.0",
     "stylelint-config-suitcss": "^8.0.0"