docs: rust-version 1.91

[skip ci]

Author: jqnatividad

README.md

@@ -8,7 +8,7 @@
 [![Crates.io](https://img.shields.io/crates/v/qsv.svg?logo=crates.io)](https://crates.io/crates/qsv)
 [![Discussions](https://img.shields.io/github/discussions/dathere/qsv)](https://github.com/dathere/qsv/discussions)
 [![Crates.io downloads](https://img.shields.io/crates/d/qsv?color=orange&label=crates.io%20downloads)](https://crates.io/crates/qsv)
-[![Minimum supported Rust version](https://img.shields.io/badge/Rust-1.90-red?logo=rust)](#minimum-supported-rust-version)
+[![Minimum supported Rust version](https://img.shields.io/badge/Rust-1.91-red?logo=rust)](#minimum-supported-rust-version)
 [![FOSSA Status](https://app.fossa.com/api/projects/git%2Bgithub.com%2Fjqnatividad%2Fqsv.svg?type=shield)](https://app.fossa.com/projects/git%2Bgithub.com%2Fjqnatividad%2Fqsv?ref=badge_shield)
 
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