Merge pull request #55 from connorshea/update-changelog

Release v0.4.0.

CHANGELOG.md

@@ -4,6 +4,8 @@ All notable changes to this project will be documented in this file. Releases ar
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## [Unreleased]
+
+## [0.4.0] - 2018-05-14
 ### Added
 - Describe the application on the home page.
 - Create a page for each browser, list all new features for each release. ([#41])
@@ -90,7 +92,8 @@ First tagged release, includes some basic functionality.
 [#51]: https://github.com/connorshea/mdn-compat-data-explorer/pull/51
 [#53]: https://github.com/connorshea/mdn-compat-data-explorer/pull/53
 
-[Unreleased]: https://github.com/olivierlacan/keep-a-changelog/compare/v0.3.1...HEAD
+[Unreleased]: https://github.com/connorshea/mdn-compat-data-explorer/compare/v0.4.0...HEAD
+[0.4.0]: https://github.com/connorshea/mdn-compat-data-explorer/compare/v0.3.1...v0.4.0
 [0.3.1]: https://github.com/connorshea/mdn-compat-data-explorer/compare/v0.3.0...v0.3.1
 [0.3.0]: https://github.com/connorshea/mdn-compat-data-explorer/compare/v0.2.1....v0.3.0
 [0.2.1]: https://github.com/connorshea/mdn-compat-data-explorer/compare/v0.2.0...v0.2.1