Update README.md

README.md

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-**Capybara** is the first unified visual creation model, i.e., a powerful video generation and editing framework designed for high-quality video synthesis and manipulation tasks.
+**Capybara** is a unified visual creation model, i.e., a powerful video generation and editing framework designed for high-quality video synthesis and manipulation tasks.
 
 The framework leverages advanced diffusion models and transformer architectures to support versatile video editing capabilities with precise control over content, motion, and camera movements.