CI add more versions of python to the github workflow

.github/workflows/pr_validation.yml

@@ -10,17 +10,19 @@ on:
 # A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs:
   run_tests:
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        python: ["3.8", "3.9", "3.10", "3.11"]
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v4
         with:
-          python-version: '3.8'
+          python-version: ${{ matrix.python }}
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install isort black==22.3.0
-          pip install flake8
           pip install pre-commit
           pip install -e ."[dev]"
           pip install -r docs/requirements.txt

README.md

@@ -50,7 +50,8 @@ If you're interested in contributing or want access to the development version,
 
 The list of package version requirements is available in `setup.py`.
 
-For reference, the code was tested with python 3.8 and the following package versions:
+For reference, the code is being tested in a github workflow (CI) with python
+3.8-3.11 and the following package versions:
 ```
 - numpy 1.23.0
 - pandas 1.4.3