🚧 dinglehopper: Try out Drone CI

.drone.jsonnet

@@ -16,6 +16,7 @@ local Pipeline(name, image) = {
 };
 
 [
+  Pipeline("python-3-4", "python:3.4"),
   Pipeline("python-3-5", "python:3.5"),
   Pipeline("python-3-6", "python:3.6"),
   Pipeline("python-3-7", "python:3.7"),