Link to other relevant crates

Author: djc

README.md

@@ -10,6 +10,11 @@ A library for querying the version of a `rustc` compiler.
 This can be used by build scripts or other tools dealing with Rust sources
 to make decisions based on the version of the compiler. Current MSRV is 1.32.0.
 
+If this is of interest, also consider looking at these other crates:
+
+* [autocfg](https://crates.io/crates/autocfg/), which helps with feature detection instead of depending on compiler versions
+* [rustversion](https://github.com/dtolnay/rustversion) provides a procedural macro with no other dependencies
+
 # Getting Started
 
 [rustc-version-rs is available on crates.io](https://crates.io/crates/rustc_version).