Update README.md

Author: souzatharsis

README.md

@@ -19,7 +19,7 @@ Abstract: *The current discourse around Large Language Models (LLMs) tends to fo
 | Chapter 1: The Evals Gap                | [pdf](https://docsend.com/view/a3s9qk8ix3btaa3u)  | [podcast](https://tamingllm.substack.com/p/chapter-1-podcast-the-evals-gap) | [html](https://www.tamingllms.com/notebooks/evals.html) | [ipynb](https://github.com/souzatharsis/tamingLLMs/blob/master/tamingllms/notebooks/evals.ipynb) | *Ready for Review*     |
 | Chapter 2: Structured Output| [pdf](https://docsend.com/view/5i88kgvkvtxucj3b) | [podcast](https://tamingllm.substack.com/p/chapter-2-podcast-structured-output) | [html](https://www.tamingllms.com/notebooks/structured_output.html) | [ipynb](https://github.com/souzatharsis/tamingLLMs/blob/master/tamingllms/notebooks/structured_output.ipynb) |  *Ready for Review*  |
 | Chapter 3: Managing Input Data | [pdf](https://docsend.com/view/dp8b6j8jgpexkvkx) | | [html](https://www.tamingllms.com/notebooks/input.html) | [ipynb](https://github.com/souzatharsis/tamingLLMs/blob/master/tamingllms/notebooks/input.ipynb) |   *Ready for Review*   | 
-| Chapter 4: Safety              | | | [html](https://www.tamingllms.com/notebooks/safety.html)  |  [ipynb](https://github.com/souzatharsis/tamingLLMs/blob/master/tamingllms/notebooks/safety.ipynb) |     |
+| Chapter 4: Safety              | [pdf](https://docsend.com/view/xzb3f6fqvy5cjzps) | | [html](https://www.tamingllms.com/notebooks/safety.html)  |  [ipynb](https://github.com/souzatharsis/tamingLLMs/blob/master/tamingllms/notebooks/safety.ipynb) |  *Ready for Review*   |
 | Chapter 5: Preference-Based Alignment     | | | [html](https://www.tamingllms.com/notebooks/alignment.html) | [ipynb](https://github.com/souzatharsis/tamingLLMs/blob/master/tamingllms/notebooks/alignment.ipynb) |     |
 | Chapter 6: Local LLMs in Practice | | | [html](https://www.tamingllms.com/notebooks/local.html) | [ipynb](https://github.com/souzatharsis/tamingLLMs/blob/master/tamingllms/notebooks/local.ipynb) |    |
 | Chapter 7: The Falling Cost Paradox               | | |              |               |        WIP              |