Update README.md

README.md

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 BismuthMix is checkpoint merge of ChilloutMix, DDosMix, El Zipang, Deliberate and RetMix.  
 V2: Change some merge ratio, update RetMix to V2 and add real-max-v3.4 and majicMIX realistic into merges.  
 V3: Change some merge ratio, update majicMIX realistic, change ChilloutMix to ChillyMix and add Shampoo Mix, AIbijoModel, GeminiX Mix, LEAU, CosplayMix, epiCRealism, Lyriel, fantasticmix and XXMix 9realistic into merges.
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-For V3, I used [my own model merger](https://github.com/Faildes/merge-models).
+V4: Change every merge ratios and add many models All models and merge ratios are written in [HERE](https://civitai.com/articles/654)
+For V3 and V4, I used [my own model merger](https://github.com/Faildes/merge-models).
 
 [**CivitAI**](https://civitai.com/models/23629/bismuthmix)
 ## Merge Source: