Update README.md

[nWEIdia]

Use cu126 to replace cu121, as in pytorch cu121 is gone and cu126 is here and would be here for a while.

[github-actions]

Description

• Update CUDA version from cu121 to cu126 in README.md

• Reflect changes in pip installation commands

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Changes walkthrough 📝

	Relevant files
Enhancement	README.md Update CUDA version in README.md                                                  README.md Updated CUDA version from cu121 to cu126 in pip installation commands Corrected typo in installation instructions +3/-3

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PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

🧪 No relevant tests

⚡ Recommended focus areas for review Typo There is a typo in the word "instll" which should be corrected to "install". You can instll a nightly nvfuser pip package built against torch nightly code base with `pip install --pre nvfuser-cu126 --extra-index-url https://pypi.nvidia.com` Typo There is a typo in the word "optinoal" which should be corrected to "optional". As we build against nightly torch wheel and there's no compatibility promised on nightly wheels, we have explicitly marked the nightly torch wheel as an optinoal dependency. You can choose to install the torch wheel along with nvfuser package. e.g. Typo There is a typo in the word "instll" which should be corrected to "install". `pip install --pre "nvfuser-cu126[torch]" --extra-index-url https://pypi.nvidia.com`.

[jjsjann123]

Thanks