Librarian Bot: Update dataset YAML metadata for model

This is a pull request to add a dataset, [`Fraser/python-lines`](https://huggingface.co/datasets/Fraser/python-lines), 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

@@ -1,3 +1,6 @@
+---
+datasets: Fraser/python-lines
+---
 # roberta_python
 ---
 language: code