fix circle ci (AtsushiSakai#419)

AtsushiSakai · web-flow · commit d90fba3717c5 · 2020-10-10T16:29:57.000+09:00
* fix circle ci

* fix circle ci

* fix circle ci
diff --git a/.circleci/config.yml b/.circleci/config.yml
@@ -5,7 +5,8 @@ orbs:
 
 jobs:
   build_doc:
-    executor: python/default
+    docker:
+      - image: circleci/python:3.8
     steps:
       - checkout
       - python/load-cache
