Run Actions in parallel and smaller python version matrix

.github/workflows/python-package.yml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.8", "3.12"]
 
     steps:
     - uses: actions/checkout@v4
@@ -20,7 +20,7 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         python -m pip install .
-        python -m pip install pytest
+        python -m pip install pytest pytest-xdist
     - name: Test with pytest
       run: |
-        pytest
+        pytest -n 4

README.md

@@ -39,7 +39,7 @@ We aim to cover the entire API, and we are looking for help. We are welcoming Pu
 
 ## Installation
 
-PyAlex requires Python 3.6 or later.
+PyAlex requires Python 3.8 or later.
 
 ```sh
 pip install pyalex