Whoops---readthedocs.yml v2 is not released yet.

readthedocs.yml

@@ -1,20 +1,13 @@
-# .readthedocs.yml
+conda:
+  file: docs/environment.yml
 
-version: 2
+# The default for requirements_file is null, but for some reason we get an error with this message if it's not set:
+# "Problem parsing YAML configuration. Invalid "requirements_file": path docs/requirements.txt does not exist"
+requirements_file: null
 
 build:
   image: latest
 
 python:
-  version: 3.7
-  install:
-     - method: setuptools
-       path: .
-
-conda:
-  environment: docs/environment.yml
-
-sphinx:
-  builder: html
-  configuration: docs/conf.py
-  fail_on_warning: false
+  version: 3.6
+  setup_py_install: true