update README.md

update README.md

update .github/workflows/ci.yml

update src/data/recommenders.py

update src/data/recommenders.py

update tests/__init__.py

update tests/__init__.py

Apply black formatting to recommender

update src/data/recommenders.py

update tests/test_recommenders.py

update tests/test_api.py

update src/data/sample_data.py

update src/data/recommenders.py

update src/data/api.py

update tests/test_recommenders.py

update tests/test_recommenders.py

update tests/test_recommenders.py

update tests/test_api.py

update src/data/sample_data.py

update src/data/recommenders.py