Bump MSRV

Author: pczarn

.github/workflows/rust.yml

@@ -77,7 +77,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        rust: [1.63.0, 1.64.0]
+        rust: [1.67.0, 1.68.0]
     timeout-minutes: 45
     steps:
       - uses: actions/checkout@v3

Cargo.toml

@@ -11,7 +11,7 @@ authors = [
 ]
 
 edition = "2021"
-rust-version = "1.63"
+rust-version = "1.67"
 
 repository = "https://github.com/contain-rs/linked-list"
 homepage = "https://github.com/contain-rs/linked-list"

README.md

@@ -8,7 +8,7 @@
 [![crates.io][crates.io shield]][crates.io link]
 [![Documentation][docs.rs badge]][docs.rs link]
 ![Rust CI][github ci badge]
-![Minimum Supported Rustc Version][rustc 1.63+]
+![Minimum Supported Rustc Version][rustc 1.67+]
 <br />
 <br />
 [![Dependency Status][deps.rs status]][deps.rs link]
@@ -22,7 +22,7 @@
 [docs.rs badge]: https://docs.rs/linked-list/badge.svg?version=0.0.3
 [docs.rs link]: https://docs.rs/linked-list/0.0.3/linked_list/
 [github ci badge]: https://github.com/contain-rs/linked-list/workflows/Rust/badge.svg?branch=master
-[rustc 1.63+]: https://img.shields.io/badge/rustc-1.63%2B-blue.svg
+[rustc 1.67+]: https://img.shields.io/badge/rustc-1.67%2B-blue.svg
 [deps.rs status]: https://deps.rs/crate/linked-list/0.0.3/status.svg
 [deps.rs link]: https://deps.rs/crate/linked-list/0.0.3
 [shields.io download count]: https://img.shields.io/crates/d/linked-list.svg