Update README.md

Author: app-generator

README.md

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-[Flask Material Kit](https://appseed.us/product/material-kit/flask/) - Open-source starter generated by **[App Generator](https://appseed.us/generator/)**.
+[Flask Material Kit](https://appseed.us/product/material-kit/flask/) - Open-source Flask Starter provided by **[App Generator](https://app-generator.dev/)**.