lower MSRV to 1.60 & define in Cargo.toml

according to [`cargo msrv`][] this is the lowest supported release.
defining it in `Cargo.toml` ensures that consumers with older rust
versions get a clear build error telling them to upgrade rust to use
this library.

[`cargo msrv`]: https://github.com/foresterre/cargo-msrv

Author: rursprung

.github/workflows/CI.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        rust: [1.65.0, stable]
+        rust: [1.60.0, stable]
         features: ['', '--all-features']
     runs-on: ubuntu-latest
     steps:

Cargo.toml

@@ -2,6 +2,7 @@
 name = "adafruit-bluefruit-protocol"
 version = "0.1.0"
 edition = "2021"
+rust-version = "1.60"
 
 description = "A `no_std` parser for the Adafruit Bluefruit LE Connect controller protocol."
 repository = "https://github.com/rursprung/adafruit-bluefruit-protocol-rs"

README.md

@@ -17,6 +17,6 @@ Note that this work is not affiliated with Adafruit.
   but you can opt to only select the event(s) you are interested in which will result in a small binary size.
   If other events are received, a `ProtocolParseError::DisabledControllerDataPackageType` will be returned.
 
-## Build-time Requirements
-The crate is tested against stable rust and rust 1.65.0 (which was the stable version at the time the crate has been built).
-It is possible that it works with older versions as well but this is not tested.
+## Minimum Supported Rust Version (MSRV)
+This crate is guaranteed to compile on stable Rust 1.60 and up. It *might*
+compile with older versions but that may change in any new patch release.