update README.md

README.md

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 # OpenECAD Models
 
-This repo releases models introducing in OpenECAD.
+This repo releases models introducing in OpenECAD (2406.09913[v1](https://arxiv.org/abs/2406.09913v1) & [v2](https://arxiv.org/abs/2406.09913v2)).
 
 The outputs of the OpenECAD models can be converted into STEP files by this tool: [Yuki-Kokomi/OpenECADtoSTEP](https://github.com/Yuki-Kokomi/OpenECADtoSTEP).
 
-You can use the model execution method mentioned in TinyLLaVA directly. ([TinyLLaVA: Launch Demo Locally](https://github.com/TinyLLaVA/TinyLLaVA_Factory?tab=readme-ov-file#launch-demo-locally))
+You can use the model execution method mentioned in TinyLLaVA directly. ([TinyLLaVA: Launch Demo Locally](https://github.com/TinyLLaVA/TinyLLaVA_Factory?tab=readme-ov-file#launch-demo-locally))
+
+For models from [v3](https://arxiv.org/abs/2406.09913v3) and onwards of the paper, please refer to the subsequent updated versions of the OpenECAD model.