update readme

README.md

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 ## Introduction
 
-Qwen1.5 is a transformer-based decoder-only language model pretrained on a large amount of data. In comparison with the previous released Qwen, the improvements include: 
+Qwen1.5 is the beta version of Qwen2, a transformer-based decoder-only language model pretrained on a large amount of data. In comparison with the previous released Qwen, the improvements include: 
 
 * 6 model sizes, including 0.5B, 1.8B, 4B, 7B, 14B, and 72B;
 * Significant performance improvement in human preference for chat models;
@@ -22,7 +22,7 @@ Qwen1.5 is a transformer-based decoder-only language model pretrained on a large
 * Stable support of 32K context length for models of all sizes
 * No need of `trust_remote_code`.
 
-For more details, please refer to our blog post and GitHub repo. In this repo, we provide the `q2_k` and `q5_k_m` quantized model in the GGUF format.
+For more details, please refer to our [blog post](https://qwenlm.github.io/blog/qwen1.5/) and [GitHub repo](https://github.com/QwenLM/Qwen1.5). In this repo, we provide the `q2_k` and `q5_k_m` quantized model in the GGUF format.
 <br>
 
 ## Model Details