Update github actions

Author: elacuesta

.github/workflows/main.yml

@@ -54,22 +54,22 @@ jobs:
 
 
   tests-no-deps:
-    name: "Test: py3.8, Ubuntu, no deps"
+    name: "Test: py3.6, Ubuntu, no deps"
     runs-on: ubuntu-latest
 
     steps:
     - uses: actions/checkout@v2
 
-    - name: Set up Python 3.8
+    - name: Set up Python 3.6
       uses: actions/setup-python@v1
       with:
-        python-version: 3.8
+        python-version: 3.6
 
     - name: Install tox
       run: pip install tox
 
     - name: Run tests
-      run: tox -e py38-no-deps
+      run: tox -e no-deps
 
     - name: Upload coverage report
       uses: codecov/codecov-action@v1