Add changelog

CHANGELOG.md

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+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+
+<!-- Use this as a template
+## [X.Y.Z] - YYYY-MM-DD
+### Added
+- for new features.
+
+### Changed
+- for changes in existing functionality.
+
+### Deprecated
+- for soon-to-be removed features.
+
+### Removed
+- for now removed features.
+
+### Fixed
+- for any bug fixes.
+
+### Security
+- in case of vulnerabilities.
+-->
+
+## [Unreleased]
+### Added
+- Begin keeping changelog (incomplete and possibly inaccurate information before this point).
+- Build RPMs in CircleCI using alien.
+
+### Changed
+- Local backpressure improvements.
+- Change `box_pub_key` to `key` in admin API.
+- Session cleanup.
+
+## [0.2.2] - 2018-06-21
+### Added
+- Add yggdrasilconf for testing with vyatta-yggdrasil.
+- Add a randomized retry delay after TCP disconnects, to prevent synchronization livelocks.
+
+### Changed
+- Update build script ot strip by default, allow debug `-d` and UPX `-u` flags.
+- Start pprof in debug builds based on an environment variable (e.g. `PPROFLISTEN=localhost:6060`), instead of a flag.
+
+### Fixed
+- Fix typo in big-endian BOM.
+
+## [0.2.1] - 2018-06-15
+### Changed
+- The address range was moved from `fd00::/8` to `200::/7`.
+
+### Fixed
+- UTF-16 conversion for configuration files.
+- Fixes to the Debian package control file.
+- Fixes to the launchd service for macOS.
+- Fixes to the DHT and switch.
+
+## [0.2.0] - 2018-06-13
+### Added
+- Exchange version information during connection setup, to prevent connections with incompatible versions.
+
+### Changed
+- Wire format changes (backwards incompatible).
+- Less maintenance traffic per peer.
+- Exponential back-off for DHT maintenance traffic (less maintenance traffic for known good peers).
+- Iterative DHT (added some time between v0.1.0 and here).
+- Use local queue sizes for a sort of local-only backpressure routing, instead of the removed bandwidth estimates, when deciding where to send a packet.
+
+### Removed
+- UDP peering, this may be added again if/when a better implementation appears.
+- Per peer bandwidth estimation.
+
+## [0.1.0] - 2018-02-01
+### Added
+- Adopt semantic versioning.
+
+### Changed
+- Wire format changes (backwards incompatible).
+- Many other undocumented changes leading up to this release and before the next one.
+
+## [0.0.1] - 2017-12-28
+### Added
+- First commit.
+- Initial public release.
+