Add changelog entry for mman safety changes
@@ -5,6 +5,9 @@ This project adheres to [Semantic Versioning](http://semver.org/).
## [Unreleased]
+- Marked `sys::mman::{ mmap, munmap, madvise, munlock, msync }` as unsafe.
+ ([#559](https://github.com/nix-rust/nix/pull/559))
+
## [0.8.0] 2017-03-02
### Added
