Add 4.0 link

README.md

@@ -16,6 +16,8 @@ Default arguments used except when the bits per weight is above 6.0, at that poi
 
 Original model: https://huggingface.co/Weyaxi/SauerkrautLM-UNA-SOLAR-Instruct
  
+<a href="https://huggingface.co/bartowski/SauerkrautLM-UNA-SOLAR-Instruct-exl2/tree/4_0">4.0 bits per weight</a>
+ 
 <a href="https://huggingface.co/bartowski/SauerkrautLM-UNA-SOLAR-Instruct-exl2/tree/5_0">5.0 bits per weight</a>
  
 <a href="https://huggingface.co/bartowski/SauerkrautLM-UNA-SOLAR-Instruct-exl2/tree/6_0">6.0 bits per weight</a>