Add note about MSRV compile failure. (#35)

* Add note about MSRV compile failure.

* Bump MSRV to 1.74 due to `clap_derive` v4.5.4.

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ env:
   # If the compilation fails, then the version specified here needs to be bumped up to reality.
   # Be sure to also update the rust-version property in the workspace Cargo.toml file,
   # plus all the README.md files of the affected packages.
-  RUST_MIN_VER: "1.70"
+  RUST_MIN_VER: "1.74"
   # List of packages that will be checked with the minimum supported Rust version.
   # This should be limited to packages that are intended for publishing.
   RUST_MIN_VER_PKGS: "-p parley"

Cargo.toml

@@ -5,7 +5,7 @@ authors = ["Chad Brokaw <[email protected]>"]
 license = "Apache-2.0 OR MIT"
 edition = "2021"
 # Keep in sync with RUST_MIN_VER in .github/workflows/ci.yml and with the relevant README.md files.
-rust-version = "1.70"
+rust-version = "1.74"
 
 [features]
 default = ["system"]

README.md

@@ -17,11 +17,23 @@ It is backed by [Swash](https://github.com/dfrg/swash).
 
 ## Minimum supported Rust Version (MSRV)
 
-This version of Parley has been verified to compile with **Rust 1.70** and later.
+This version of Parley has been verified to compile with **Rust 1.74** and later.
 
 Future versions of Parley might increase the Rust version requirement.
 It will not be treated as a breaking change and as such can even happen with small patch releases.
 
+<details>
+<summary>Click here if compiling fails.</summary>
+
+As time has passed, some of Parley's dependencies could have released versions with a higher Rust requirement.
+If you encounter a compilation issue due to a dependency and don't want to upgrade your Rust toolchain, then you could downgrade the dependency.
+
+```sh
+# Use the problematic dependency's name and version
+cargo update -p package_name --precise 0.1.1
+```
+</details>
+
 ## Community
 
 Discussion of Parley development happens in the [Linebender Zulip](https://xi.zulipchat.com/), specifically the [#text stream](https://xi.zulipchat.com/#narrow/stream/205635-text).