Update WINNER_GROUP_MESSAGE name

[Namaskar-1F64F]

fixes #69

[vercel[bot]]

This pull request is being automatically deployed with Vercel (learn more).
To see the status of your deployment, click below or on the icon next to each commit.

🔍 Inspect: https://vercel.com/alwaysbegrowing/stoodbot/A9mQsoozazEypQ9krdtHJDMPC47o
✅ Preview: https://stoodbot-git-bug-69-fix-winner-message-name-alwaysbegrowing.vercel.app