remove outdated reference to Black formatting, done by robots now

crccheck · crccheck · commit bf8a06f21af7 · 2025-08-06T06:01:55.000Z
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -1,4 +0,0 @@
-This project uses [Black] to format code. To avoid manually running `black .`,
-you can install a Git hook or a format-on-save plugin for your editor.
-
-[Black]: https://github.com/psf/black
