Try Drone CI

.drone.yml

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+pipeline:
+  build:
+    image: python:3
+    commands:
+      - pip install -r requirements.txt
+      - pip install -r dev-requirements.txt
+      - mypy --version
+      - mypy --ignore-missing-imports little_boxes
+      - flake8 little_boxes
+      - black --check .
+      - python -m pytest -vv --cov=little_boxes
+      - codecov