Fix changelog from bad merge

CHANGELOG.md

@@ -5,6 +5,12 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+### Added
+- Added `nix::poll` module for all platforms
+  ([#672](https://github.com/nix-rust/nix/pull/672))
+- Added `nix::ppoll` function for FreeBSD and DragonFly
+  ([#672](https://github.com/nix-rust/nix/pull/672))
+
 ### Changed
 - Renamed existing `ptrace` wrappers to encourage namespacing ([#692](https://github.com/nix-rust/nix/pull/692))
 
@@ -34,10 +40,6 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 - On Linux and Android, added support for receiving `PTRACE_O_TRACESYSGOOD`
   events from `wait` and `waitpid` using `WaitStatus::PtraceSyscall`
   ([#566](https://github.com/nix-rust/nix/pull/566)).
-- Added `nix::poll` module for all platforms
-  ([#672](https://github.com/nix-rust/nix/pull/672))
-- Added `nix::ppoll` function for FreeBSD and DragonFly
-  ([#672](https://github.com/nix-rust/nix/pull/672))
 
 ### Changed
 - The `ioctl!` macro and its variants now allow the generated functions to have