Run py3.9 and tests in CI

.github/workflows/ci.yml

@@ -7,15 +7,22 @@ jobs:
     name: 'pip install'
     runs-on: ubuntu-latest
     steps:
+
       - name: Checkout
         uses: actions/checkout@v2
         with:
-          ref: chart_hacking
+          ref: master
+
       - name: Setup python
         uses: actions/setup-python@v2
         with:
-          python-version: '3.8'
+          python-version: '3.9'
+
       - name: Install dependencies
         run: pip install -e . --upgrade-strategy eager -r requirements.txt
-      - name: Run piker
+
+      - name: Run piker cli
         run: piker 
+
+      - name: Run test suite
+        run: pytest tests