Set MSRV to 1.64

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
           - stable
           - beta
           - nightly
-          - 1.56.0  # MSRV
+          - 1.64.0  # MSRV
 
     steps:
       - uses: actions/checkout@v2

Cargo.toml

@@ -10,6 +10,7 @@ homepage = "https://github.com/noeddl/ukebox"
 repository = "https://github.com/noeddl/ukebox"
 keywords = ["ukulele", "chords", "music", "cli"]
 categories = ["command-line-utilities"]
+rust-version = "1.64"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

README.md

@@ -4,7 +4,7 @@
 [![Documentation](https://docs.rs/ukebox/badge.svg)](https://docs.rs/ukebox)
 [![Continuous integration](https://github.com/noeddl/ukebox/actions/workflows/ci.yml/badge.svg)](https://github.com/noeddl/ukebox/actions/workflows/ci.yml)
 [![license](https://img.shields.io/crates/l/ukebox)](#license)
-[![rustc](https://img.shields.io/badge/rustc-1.56+-lightgray.svg)](https://blog.rust-lang.org/2021/10/21/Rust-1.56.0.html)
+[![rustc](https://img.shields.io/badge/rustc-1.64+-lightgray.svg)](https://blog.rust-lang.org/2022/09/22/Rust-1.64.0.html)
 
 `ukebox` is a ukulele chord toolbox for the command line written in Rust.