Change github test workflow: add coverage and bandit

.github/workflows/test.yml

@@ -25,7 +25,7 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         pip install wheel
-        pip install flake8 pylint
+        pip install bandit flake8 pylint
         pip install -r requirements.txt
         python setup.py install
     - name: Lint
@@ -35,7 +35,10 @@ jobs:
         flake8 minode --count --select=E9,F63,F7,F82 --show-source --statistics
         flake8 minode --count --statistics
         pylint minode --exit-zero --rcfile=tox.ini
+        bandit -r --exit-zero -x tests minode
     - name: Test
       run: |
         export PYTHONWARNINGS=all
-        python -bm tests
+        coverage run -a -m tests
+    - name: Summary
+      run: coverage report