chore(package): update eslint-config-problems to version 3.1.0

Closes #279

Author: greenkeeper[bot]

package.json

@@ -35,7 +35,7 @@
     "ava": "^1.0.1",
     "coveralls": "^3.0.0",
     "eslint": "^5.0.0",
-    "eslint-config-problems": "2.0.0",
+    "eslint-config-problems": "3.1.0",
     "nyc": "^14.0.0",
     "postcss-import": "^12.0.0",
     "prettier": "~1.18.0",