Minor edit to changelog

Add section headings, commenting out unused ones.
nix-rust · Mar 19, 2017 · 902f281 · 902f281
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commit 902f281
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -5,8 +5,13 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+<!--### Added-->
+
+### Changed
 - Marked `sys::mman::{ mmap, munmap, madvise, munlock, msync }` as unsafe.
   ([#559](https://github.com/nix-rust/nix/pull/559))
+
+<!--### Fixed-->
 
 ## [0.8.0] 2017-03-02