Librarian Bot: Update dataset YAML metadata for model

This is a pull request to add a dataset, [`ccdv/pubmed-summarization`](https://huggingface.co/datasets/ccdv/pubmed-summarization), to the metadata for your model (defined in the `YAML` block of your model's `README.md`).
The pull request was made by [librarian-bot](https://huggingface.co/librarian-bot) and used a combination of rules and/or machine learning to suggest this additional metadata.
If this suggestion is incorrect, feel free to close this pull request.

Librarian Bot was made by [@davanstrien](https://huggingface.co/davanstrien); feel free to get in touch with feedback.

README.md

@@ -3,6 +3,7 @@ license: apache-2.0
 tags:
 - summarization
 - generated_from_trainer
+datasets: ccdv/pubmed-summarization
 metrics:
 - rouge
 model-index: