bump the RTD file to v2 so builds pass (#76)

* bump the RTD file to v2 so builds pass

* trigger ci

.readthedocs.yml

@@ -1,11 +1,29 @@
-requirements_file: doc/requirements.txt
+# .readthedocs.yml
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
 
-build:
-    image: latest
+# Required
+version: 2
 
-python:
-    version: 3.8
+# Build documentation in the doc/ directory with Sphinx
+sphinx:
+  configuration: doc/conf.py
 
-# Don't build any extra formats
+# Build documentation with MkDocs
+#mkdocs:
+#  configuration: mkdocs.yml
+
+# Optionally build your docs in additional formats such as PDF and ePub
 formats:
-    - none
+  - htmlzip
+
+# Optionally set the version of Python and requirements required to build your docs
+python:
+  version: 3.8
+  install:
+    - requirements: doc/requirements.txt
+    - method: pip
+      path: .
+
+build:
+  image: latest