Merge pull request 'Update README.md' (#160) from chrboesch-readme into main

Reviewed-on: https://codeberg.org/ziglings/exercises/pulls/160

README.md

@@ -229,6 +229,7 @@ Zig Core Language
 * [X] Bit manipulation
 * [X] Working with C
 * [X] Threading
+* [ ] Labeled switch (#21257)
 
 Zig Standard Library