remove year

Author: semaphoreP

Diff for: README.md

@@ -2,7 +2,7 @@
 
 [![A rectangular badge, half black half purple containing the text made at Code Astro](https://img.shields.io/badge/Made%20at-Code/Astro-blueviolet.svg)](https://semaphorep.github.io/codeastro/)
 
-Course materials for the 2023 Code/Astro workshop. 
+Course materials for the Code/Astro workshop. 
 
 Workshop website: https://semaphorep.github.io/codeastro/