Add changelog.

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## 0.1.0 - 2020-09-07
+
+### Added
+- Add Docker support
+  [#7](https://github.com/strukturag/nextcloud-spreed-signaling/pull/7)
+- Added basic stats API
+  [#16](https://github.com/strukturag/nextcloud-spreed-signaling/pull/16)
+- Add "reason" field to disinvite messages
+  [#26](https://github.com/strukturag/nextcloud-spreed-signaling/pull/26)
+- Added support for multiple Nextcloud backends
+  [#28](https://github.com/strukturag/nextcloud-spreed-signaling/pull/28)
+- Support connecting to multiple Janus servers
+  [#36](https://github.com/strukturag/nextcloud-spreed-signaling/pull/36)
+- Added support for loading proxy tokens from etcd cluser
+  [#44](https://github.com/strukturag/nextcloud-spreed-signaling/pull/44)
+- Proxy URLs are reloaded on SIGHUP
+  [#46](https://github.com/strukturag/nextcloud-spreed-signaling/pull/46)
+- Added support for loading proxy URls from etcd cluster
+  [#47](https://github.com/strukturag/nextcloud-spreed-signaling/pull/47)
+- Add option to override GeoIP lookups (e.g. for local addresses)
+  [#48](https://github.com/strukturag/nextcloud-spreed-signaling/pull/48)
+
+### Changed
+- The continent map is no longer downloaded on each build
+  [#29](https://github.com/strukturag/nextcloud-spreed-signaling/pull/29)
+- NATS messages are processed directly
+  [#35](https://github.com/strukturag/nextcloud-spreed-signaling/pull/35)
+- Support changed "slowlink" message from Janus > 0.7.3
+  [#39](https://github.com/strukturag/nextcloud-spreed-signaling/pull/39)
+- The GeoIP database can be loaded from a local file
+  [#40](https://github.com/strukturag/nextcloud-spreed-signaling/pull/40)
+- Drop support for Golang < 1.10.
+
+### Fixed
+- Fixes for building on FreeBSD
+  [#2](https://github.com/strukturag/nextcloud-spreed-signaling/pull/2)
+- Fixes for typos in comments and error messages
+  [#10](https://github.com/strukturag/nextcloud-spreed-signaling/pull/10)
+- Remove credentials from log
+  [#13](https://github.com/strukturag/nextcloud-spreed-signaling/pull/13)
+
+### Documentation
+- Add systemd to docs
+  [#3](https://github.com/strukturag/nextcloud-spreed-signaling/pull/3)
+- Add caddy server to reverse proxy examples
+  [#5](https://github.com/strukturag/nextcloud-spreed-signaling/pull/5)
+- Update link to API documentation
+  [#6](https://github.com/strukturag/nextcloud-spreed-signaling/pull/6)
+- Update build requirements
+  [#12](https://github.com/strukturag/nextcloud-spreed-signaling/pull/12)
+
+
+## 0.0.13 - 2020-05-12
+
+- Initial OpenSource version.