Updating changelog for the 0.5.2 release.

CHANGELOG.md

@@ -4,10 +4,17 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/).
 
-## [Unreleased]
+## [0.5.2]
+
 ### Added
 - `nixpkgs_package` now has a new optional argument `fail_not_supported`
   allowing the rule to _not_ fail on Windows (when set to `False`)
+- `nixpkgs_cc_configure` now has a new optional argument `nixopts` which
+  propagates extra arguments to the `nix-build` calls.
+
+### Fixed
+- The `nixpkgs_package` is now a no-op on non nixpkgs-supported platforms
+  instead of throwing an error.
 
 ## [0.5.1] - 2018-12-18