Librarian Bot: Update dataset YAML metadata for model

This is a pull request to add a dataset, [`demelin/understanding_fables`](https://huggingface.co/datasets/demelin/understanding_fables), 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

@@ -5,15 +5,16 @@ tags:
 - distilgpt2
 - text-generation
 - english
-model-index:
-- name: distilgpt2-fables-demo
-  results: []
+datasets: demelin/understanding_fables
 pipeline:
 - text-generation
 widget:
 - text: Once upon a time,
 - text: There was a time when
 - text: Long time ago
+model-index:
+- name: distilgpt2-fables-demo
+  results: []
 ---
 
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