* Updated `linkedin-messaging` to
  [v0.2.1](https://github.com/sumnerevans/linkedin-messaging-api/releases/tag/v0.2.1).
* Pinned `python-olm` at 3.2.1.
* Implemented logout. (#56)
* Migrated to GitLab from GitHub. Be sure to update your remotes!
* Added automated Docker container build. See the image registry here:
  https://gitlab.com/beeper/linkedin-matrix/container_registry.
* Changed `real_user_content_key` to `com.sumnerevans.linkedin.puppet`.
* Added provisioning API for managing the bridge over HTTP(S).
* Fixed some instances of text that was copied from other bridges to correctly
  reference LinkedIn.