Add pre-commit badge

.pre-commit-config.yaml

@@ -10,10 +10,6 @@ repos:
     rev: 23.10.0
     hooks:
       - id: black
--   repo: https://github.com/PyCQA/isort
-    rev: 5.12.0
-    hooks:
-    -   id: isort
 -   repo: https://github.com/charliermarsh/ruff-pre-commit
     # Ruff version.
     rev: "v0.1.1"

README.md

@@ -1,3 +1,5 @@
+[![pre-commit](https://img.shields.io/badge/pre--commit-enabled-brightgreen?logo=pre-commit)](https://github.com/pre-commit/pre-commit)
+
 # Advent of Code
 
 Solutions to the problems proposed at https://adventofcode.com