🚧 dinglehopper: Try out Drone CI

.drone.yml

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+local Pipeline(name, image) = {
+  kind: "pipeline",
+  name: name,
+  steps: [
+    {
+      name: "test",
+      image: image,
+      commands: [
+        "pip install -U pip",
+        "pip install -r requirements.txt",
+        "pip install pytest",
+        "pytest"
+      ]
+    }
+  ]
+};
+
+[
+  Pipeline("python-3-5", "python:3.5"),
+  Pipeline("python-3-6", "python:3.6"),
+  Pipeline("python-3-7", "python:3.7"),
+  Pipeline("python-3-8", "python:3.8"),
+  Pipeline("python-3-9", "python:3.9"),
+]