Merge #264

264: Document MSRV in README r=korken89 a=eldruin

See: rust-embedded/wg#445

Co-authored-by: Diego Barrios Romero <[email protected]>

Author: bors[bot]

README.md

@@ -9,6 +9,11 @@ This project is developed and maintained by the [Cortex-M team][team].
 
 # [Documentation](https://docs.rs/cortex-m-rt)
 
+# Minimum Supported Rust Version (MSRV)
+
+This crate is guaranteed to compile on stable Rust 1.39.0 and up. It *might*
+compile with older versions but that may change in any new patch release.
+
 # License
 
 Licensed under either of