Add comment about sign-ups being closed

alternative-2-kivy-application/README.md

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 # Kivy Application Qualifier
 
-- **Deadline:** 2020-01-10 12:00 UTC
-- **Submission form:** https://forms.gle/MzzZs9mFMKe2bwP77
-- **Theme suggestions:** https://forms.gle/ejkha9bF6kKjnRJJA
+- **Sign-up form:** The sign-up period for the Winter Code Jam 2020 has ended and you can no longer sign-up for the event. If you want to participate in a Code Jam in the future, subscribe yourself to the announcements of our community to not miss an announcement about the Summer Code Jam! You can do this by using the `!subscribe` command in the #bot-commands channel.
 
 This qualifier task for the upcoming [Winter Code Jam](https://pythondiscord.com/pages/code-jams/code-jam-6/) is to write a Kivy application in which the end user can move around an image on screen. Use the [`python_discord_logo.png`](python_discord_logo.png) image in this subdirectory of the qualifier repository as the default image, so we can run your code using the same image you've used while creating your application.