[tooling] Remove extra comma in contribution message

[jovnc]

Currently, there is an extra comma in the exercise-sources JSON, which causes an error in JSON parsing if we copy it over.

Fixed the bug to improve developer experience, so that they can copy it directly without any errrors.

[github-actions]

Hi @jovnc, thank you for your contribution! 🎉

This PR comes from your fork jovnc/exercises on branch fix/contribution-message.

Before you request for a review, please ensure that you have tested your changes locally!

Important

The previously recommended way of using ./test-download.py is no longer the best way to test your changes locally.

Please read the following instructions for the latest instructions.

Prerequisites

Ensure that you have the gitmastery app installed locally (instructions)

Testing steps

If you already have a local Git-Mastery root to test, you can skip the following step.

Create a Git-Mastery root locally:

gitmastery setup

Navigate into the Git-Mastery root (defaults to gitmastery-exercises/):

cd gitmastery-exercises/

Edit the .gitmastery.json configuration file. You need to set the following values under the exercises_source key.

{
    # other fields...
    "exercises_source": {
        "username": "jovnc",
        "repository": "exercises",
        "branch": "fix/contribution-message",
    }
}

Then, you can use the gitmastery app to download and verify your changes locally.

gitmastery download <your new change>
gitmastery verify

Checklist

• (For exercises and hands-ons) I have verified that the downloading behavior works
• (For exercises only) I have verified that the verification behavior is accurate

Important

To any reviewers of this pull request, please use the same instructions above to test the changes.

[SAN-MUYUN]

Thanks for spotting this issue, LGTM!

[jiaxinnns]

Have tested it out and LGTM!