chore(readme): bump tokens-generated badge to 350+ billion (#593)

Author: johnnygreco

README.md

@@ -2,7 +2,7 @@
 
 [![CI](https://github.com/NVIDIA-NeMo/DataDesigner/actions/workflows/ci.yml/badge.svg)](https://github.com/NVIDIA-NeMo/DataDesigner/actions/workflows/ci.yml)
 [![License](https://img.shields.io/badge/License-Apache_2.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
-[![Python 3.10 - 3.13](https://img.shields.io/badge/🐍_Python-3.10_|_3.11_|_3.12_|_3.13-blue.svg)](https://www.python.org/downloads/) [![NeMo Microservices](https://img.shields.io/badge/NeMo-Microservices-76b900)](https://docs.nvidia.com/nemo/microservices/latest/index.html) [![Code](https://img.shields.io/badge/Code-Documentation-8A2BE2.svg)](https://nvidia-nemo.github.io/DataDesigner/) ![Tokens](https://img.shields.io/badge/250+_Billion-Tokens_Generated-76b900.svg?logo=nvidia&logoColor=white)
+[![Python 3.10 - 3.13](https://img.shields.io/badge/🐍_Python-3.10_|_3.11_|_3.12_|_3.13-blue.svg)](https://www.python.org/downloads/) [![NeMo Microservices](https://img.shields.io/badge/NeMo-Microservices-76b900)](https://docs.nvidia.com/nemo/microservices/latest/index.html) [![Code](https://img.shields.io/badge/Code-Documentation-8A2BE2.svg)](https://nvidia-nemo.github.io/DataDesigner/) ![Tokens](https://img.shields.io/badge/350+_Billion-Tokens_Generated-76b900.svg?logo=nvidia&logoColor=white)
 
 **Generate high-quality synthetic datasets from scratch or using your own seed data.**