set python-version to 3.8.0

Author: RedTea

.github/workflows/python-app.yml

@@ -20,10 +20,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-    - name: Set up Python 3.8
+    - name: Set up Python 3.8.0
       uses: actions/setup-python@v2
       with:
-        python-version: 3.8
+        python-version: 3.8.0
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip