Run pre-commits instead of black in ci

also run it against all files

.github/workflows/test.yml

@@ -3,22 +3,14 @@ name: Tests
 on: [push, pull_request, workflow_dispatch]
 
 jobs:
-  formatting:
-    name: Check Black Formatting
+  pre-commit:
+    name: Run pre-commits
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-      - name: Set up Python 3.10
-        uses: actions/setup-python@v2
-        with:
-          python-version: "3.10"
-      - name: Install black
-        run: |
-          python -m pip install --upgrade pip
-          pip install black
-      - name: Check code formatting with black
-        run: |
-          black --check --diff --color django_pwned tests setup.py
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v4
+      - uses: pre-commit/[email protected]
+
   test:
     name: Test
     runs-on: ubuntu-latest

setup.py

@@ -4,7 +4,7 @@
 
 from django_pwned import __version__
 
-with open(os.path.join(os.path.dirname(__file__), "README.md"), "r", encoding="UTF-8") as readme:
+with open(os.path.join(os.path.dirname(__file__), "README.md"), encoding="UTF-8") as readme:
     README = readme.read()
 
 # allow setup.py to be run from any path