update news of Prompt flow integration

README.md

@@ -19,7 +19,7 @@
 https://github.com/microsoft/LLMLingua/assets/30883354/eb0ea70d-6d4c-4aa7-8977-61f94bb87438
 
 ## News
-
+- 🧩 LLMLingua has been integrated into [Prompt flow](https://microsoft.github.io/promptflow/integrations/tools/llmlingua-prompt-compression-tool.html), a streamlined tool framework for LLM-based AI applications.
 - 🦚 We're excited to announce the release of **LLMLingua-2**, boasting a 3x-6x speed improvement over LLMLingua! For more information, check out our [paper](https://arxiv.org/abs/2403.12968), visit the [project page](https://llmlingua.com/llmlingua2.html), and explore our [demo](https://huggingface.co/spaces/microsoft/LLMLingua-2).
 - 👾 LLMLingua has been integrated into [LangChain](https://github.com/langchain-ai/langchain/blob/master/docs/docs/integrations/retrievers/llmlingua.ipynb) and [LlamaIndex](https://github.com/run-llama/llama_index/blob/main/docs/examples/node_postprocessor/LongLLMLingua.ipynb), two widely-used RAG frameworks.
 - 🤳 Talk slides are available in [AI Time Jan, 24](https://drive.google.com/file/d/1fzK3wOvy2boF7XzaYuq2bQ3jFeP1WMk3/view?usp=sharing).