README to rst, update github workflows

.github/workflows/python_tests.yml

@@ -7,29 +7,23 @@ on: [push, pull_request]
 
 jobs:
   build:
-
-    runs-on: ubuntu-latest
     strategy:
+      fail-fast: false
       matrix:
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
+        platform: [windows-latest, macos-latest, ubuntu-latest]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+    runs-on: ${{ matrix.platform }}
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies
         run: |
-          python -m pip install --upgrade pip
-          pip install flake8 pytest respx
-          pip install -e .
-      - name: Lint with flake8
-        run: |
-          # stop the build if there are Python syntax errors or undefined names
-          flake8 --count --select=E9,F63,F7,F82 --show-source --statistics nbank test
-          # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
-          flake8 --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics nbank test
+          python -m pip install --upgrade pip setuptools wheel
+          pip install -e .[test]
       - name: Test with pytest
         run: |
           pytest -v