remove addition of plugin

Author: bendhouseart

.readthedocs.yaml

@@ -23,7 +23,6 @@ build:
       # install poetry
       - pip install poetry==1.6.1
       - poetry config virtualenvs.create false
-      - poetry self add poetry-plugin-export
       # just use poetry to export a requirements.txt as that worked much better than the previous attempts
       - cd pypet2bids && poetry lock && poetry export --without-hashes --with dev --format=requirements.txt > requirements.txt