Update .readthedocs.yml

Author: jan-janssen

.readthedocs.yml

@@ -12,6 +12,8 @@ build:
   jobs:
     pre_build:
       # Generate the Sphinx configuration for this Jupyter Book so it builds.
+      - pip install versioneer[toml]==0.29
+      - pip install . --no-deps --no-build-isolation
       - "cp README.md docs"
       - "cp notebooks/*.ipynb docs"
       - "jupyter-book config sphinx docs/"