Update eslint-config-problems to version 3.1.0 (#306)

Closes #279

Co-authored-by: greenkeeper[bot] <23040076+greenkeeper[bot]@users.noreply.github.com>

Author: RyanZim

package.json

@@ -35,7 +35,7 @@
     "ava": "^2.4.0",
     "coveralls": "^3.0.0",
     "eslint": "^6.8.0",
-    "eslint-config-problems": "2.0.0",
+    "eslint-config-problems": "3.1.0",
     "nyc": "^15.0.0",
     "postcss-import": "^12.0.0",
     "prettier": "~1.19.1",