fix rtd

.readthedocs.yml

@@ -1,13 +1,11 @@
-# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
-
 version: 2
 
 build:
   os: ubuntu-20.04
   tools:
     python: "3.11"
   jobs:
-    post_install:
+    pre_build:
       - pip install poetry
       - poetry config virtualenvs.create false
       - poetry install --only docs