Update visualization.md

docs/docs_en/visualization.md

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+**Deoldify Huggingface Web Demo**: Integrated to [Huggingface Spaces](https://huggingface.co/spaces) with [Gradio](https://github.com/gradio-app/gradio). See demo: [![Hugging Face Spaces](https://img.shields.io/badge/%F0%9F%A4%97%20Hugging%20Face-Spaces-blue)](https://huggingface.co/spaces/akhaliq/deoldify)
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 ### Image Generation
 - Including portrait cartoonization, street scene cartoonization, and style transfer.
 - Many thanks to CopyRight@[PaddleGAN](https://github.com/PaddlePaddle/PaddleGAN)、CopyRight@[AnimeGAN](https://github.com/TachibanaYoshino/AnimeGANv2)for the pre-trained models.