Add Aquila2 to README (#1331)

Signed-off-by: ldwang <ftgreat@gmail.com>
Co-authored-by: ldwang <ftgreat@gmail.com>

README.md

@@ -46,7 +46,7 @@ vLLM is flexible and easy to use with:
 
 vLLM seamlessly supports many Hugging Face models, including the following architectures:
 
-- Aquila (`BAAI/Aquila-7B`, `BAAI/AquilaChat-7B`, etc.)
+- Aquila & Aquila2 (`BAAI/AquilaChat2-7B`, `BAAI/AquilaChat2-34B`, `BAAI/Aquila-7B`, `BAAI/AquilaChat-7B`, etc.)
 - Baichuan (`baichuan-inc/Baichuan-7B`, `baichuan-inc/Baichuan-13B-Chat`, etc.)
 - BLOOM (`bigscience/bloom`, `bigscience/bloomz`, etc.)
 - Falcon (`tiiuae/falcon-7b`, `tiiuae/falcon-40b`, `tiiuae/falcon-rw-7b`, etc.)