Try readthedocs build

.readthedocs.yml

@@ -0,0 +1,20 @@
+version: 2
+
+# VCS submodules configuration
+submodules:
+  include: all
+  recursive: true
+
+# Optionally set the version of Python and requirements required to build your
+# docs
+python:
+  version: 3.7
+  install:
+    - method: pip
+      path: .
+      extra_requirements:
+         - docs
+
+# Build documentation in the docs/ directory with Sphinx
+sphinx:
+  configuration: docs/conf.py