再尝试一次

.readthedocs.yml

@@ -1,11 +0,0 @@
-version: 2
-
-sphinx:
-  configuration: docs/conf.py
-
-build:
-  image: latest
-
-python:
-  version: 3.6
-  setup_py_install: true

docs/readthedocs.yml

@@ -0,0 +1,15 @@
+version: 2
+
+sphinx:
+  configuration: source/conf.py
+
+build:
+  image: latest
+
+python:
+  version: 3.6
+  setup_py_install: true
+
+
+formats:
+  - htmlzip

readthedocs.yml

@@ -0,0 +1,15 @@
+version: 2
+
+sphinx:
+  configuration: docs/source/conf.py
+
+build:
+  image: latest
+
+python:
+  version: 3.6
+  setup_py_install: true
+
+
+formats:
+  - htmlzip