[skip ci] reformat CHANGELOG

Author: asomers

CHANGELOG.md

@@ -13,32 +13,29 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 - Added `getpeereid` (#[1342](https://github.com/nix-rust/nix/pull/1342))
 - Implemented `IntoIterator` for `Dir`
   (#[1333](https://github.com/nix-rust/nix/pull/1333)).
-### Changed
-
-### Fixed
-- `TimerFd` now closes the underlying fd on drop.
-  ([#1381](https://github.com/nix-rust/nix/pull/1381))
-- Define `*_MAGIC` filesystem constants on Linux s390x
-  (#[1372](https://github.com/nix-rust/nix/pull/1372))
-- mqueue, sysinfo, timespec, statfs, test_ptrace_syscall() on x32
-  (#[1366](https://github.com/nix-rust/nix/pull/1366))
 
 ### Changed
 
 - Minimum supported Rust version is now 1.40.0.
   ([#1356](https://github.com/nix-rust/nix/pull/1356))
-
 - i686-apple-darwin has been demoted to Tier 2 support, because it's deprecated
   by Xcode.
   (#[1350](https://github.com/nix-rust/nix/pull/1350))
 - Fixed calling `recvfrom` on an `AddrFamily::Packet` socket
   (#[1344](https://github.com/nix-rust/nix/pull/1344))
 
+### Fixed
+- `TimerFd` now closes the underlying fd on drop.
+  ([#1381](https://github.com/nix-rust/nix/pull/1381))
+- Define `*_MAGIC` filesystem constants on Linux s390x
+  (#[1372](https://github.com/nix-rust/nix/pull/1372))
+- mqueue, sysinfo, timespec, statfs, test_ptrace_syscall() on x32
+  (#[1366](https://github.com/nix-rust/nix/pull/1366))
+
 ### Removed
 
 - `Dir`, `SignalFd`, and `PtyMaster` are no longer `Clone`.
   (#[1382](https://github.com/nix-rust/nix/pull/1382))
-
 - Removed `SockLevel`, which hasn't been used for a few years
   (#[1362](https://github.com/nix-rust/nix/pull/1362))
 - Removed both `Copy` and `Clone` from `TimerFd`.