Document MSRV of 1.60.0 and add to CI

.github/workflows/ci.yaml

@@ -17,6 +17,15 @@ on:
 name: CI
 
 jobs:
+  msrv:
+    name: MSRV
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: dtolnay/rust-toolchain@1.60.0
+      - uses: Swatinem/rust-cache@v1
+      - run: cargo build
+
   check:
     name: Check
     runs-on: ubuntu-latest

README.md

@@ -37,6 +37,14 @@ reading and writing GPT data to an abstract disk interface. This
 interface can be implemented for any backend that supports block-level
 IO.
 
+## Minimum Supported Rust Version (MSRV)
+
+The current MSRV is 1.60.0 due to the use of the Cargo [`dep:`]
+feature. Feel free to file an issue or create a PR if you have a use
+case that requires an older version.
+
+[`dep:`]: https://blog.rust-lang.org/2022/04/07/Rust-1.60.0.html#new-syntax-for-cargo-features
+
 ## Code layout
 
 [`uguid/src`](uguid/src):