update README.md: latest version badge

README.md

 NVENC and NvFBC patches for Nvidia drivers
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+![GitHub last commit](https://img.shields.io/github/last-commit/keylase/nvidia-patch.svg) ![Latest version](https://img.shields.io/badge/latest%20linux%20driver%20version-455.23.04-brightgreen.svg)
 
 [NVENC patch](patch.sh) removes restriction on maximum number of simultaneous NVENC video encoding sessions imposed by Nvidia to consumer-grade GPUs.