message: Fix trailling comma
  Remove extra trailing at the last line of rules
  * Trailing comma or any other violations is causing .json files stop working
diff: @@ -31,7 +31,7 @@ Then configure the rules you want to use under the rules section.
  "jest/no-disabled-tests": "warn",
  "jest/no-focused-tests": "error",
  "jest/no-identical-title": "error",
  - "jest/valid-expect": "error",
  + "jest/valid-expect": "error"
  }
  }
  ```
  