Add changelog entry for mman safety changes

kevinmehall · kevinmehall · commit fd05a5b2292f · 2017-03-19T12:06:56.000-07:00
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -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
