ci: use python3.6 for tools

mmlb · mmlb · commit 3085d375c610 · 2018-09-04T14:32:54.000-04:00
diff --git a/.drone.yml b/.drone.yml
@@ -8,7 +8,7 @@ matrix:
 
 pipeline:
   fmt_and_lint:
-    image: python:alpine
+    image: python:3.6-alpine
     commands:
       - pip install pylama yapf
       - yapf -dr packet | (! grep '.')
