Update README.md

README.md

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-w4a8 is work in progress, for testing only, further info here:
+w4a8 is experimental format using 4bit weights and int8-convrot activations, at testing phase, further info here:
 
 https://github.com/Comfy-Org/comfy-kitchen/pull/90
 
-int8_convrot VAE currently needs this PR: https://github.com/Comfy-Org/ComfyUI/pull/15334
+Requires ComfyUI 0.31.0
+
+---
+
+int8_convrot VAE needs ComfyUI 0.31.0 or you get black outputs
+
+It speeds up VAE decode times by ~1.5x
+
+---
+
+ref lora is the difference between fl2va and ref2va, completely experimental, I don't even know if it has a use case at this point.