fix drone

.drone.yml

@@ -9,8 +9,9 @@ steps:
          - main
      commands:
       - pip install poetry
-      - cd bstools && poetry install && cd ../
-      - python bstools/bstools.py fetch-mentions --mentions-file ./brainsteam/data/mentions.json
+      - cd bstools 
+      - poetry install
+      - poetry run python bstools.py fetch-mentions --mentions-file ../brainsteam/data/mentions.json
 
    - name: store_webmentions
      image: appleboy/drone-git-push
@@ -21,7 +22,7 @@ steps:
        commit: true
        commit_message: Commit latest webmentions
        author_name: DroneCI
-       
+
    - name: hugo_build
      image: alombarte/hugo
      when: