Fix formatting

Author: eldruin

README.md

@@ -4,7 +4,7 @@
 
 This project is developed and maintained by the [Cortex-R team][team].
 
-# Minimum Supported Rust Version (MSRV)
+## Minimum Supported Rust Version (MSRV)
 
 This crate is guaranteed to compile on stable Rust 1.31.0 and up. It *might*
 compile with older versions but that may change in any new patch release.