Add a CHANGELOG.md file

CHANGELOG.md

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+# Change Log
+All notable changes to this project will be documented in this file.
+This project adheres to [Semantic Versioning](http://semver.org/).
+
+## [Unreleased]
+### Added
+- Inbucket now builds with Go 1.5 or 1.6
+- Project can build & run inside a Docker container
+- Add new default theme based on Bootstrap
+- Your recently accessed mailboxes are listed in the GUI
+- HTML-only messages now get down-converted to plain text automatically
+- This change log
+
+### Changed
+- RESTful API moved to `/api/v1` base URI
+- More graceful shutdown on Ctrl-C or when errors encountered
+
+## [1.0] - 2014-04-14
+### Added
+- Add new configuration option `mailbox.message.cap` to prevent individual
+  mailboxes from growing too large.
+- Add Link button to messages, allows for directing another person to a
+  specific message.
+
+[Unreleased]: https://github.com/jhillyerd/inbucket/compare/1.0...HEAD
+[1.0]:        https://github.com/jhillyerd/inbucket/compare/1.0-rc1...1.0
+
+See http://keepachangelog.com/ for instructions on how to update this file.