Bump Python to 3.8

Author: wragge

.github/workflows/main.yml

@@ -10,7 +10,7 @@ jobs:
     - uses: actions/checkout@v1
     - uses: actions/setup-python@v1
       with:
-        python-version: '3.6'
+        python-version: '3.8'
         architecture: 'x64'
     - name: Install the library
       run: |