message: Updating changelog for 0.6.0
diff: Changelog
  =========
  -0.5.1 (????-??-??)
  +0.6.0 (2019-07-30)
  ------------------
  -* Added support for registration.
  +* Added a registration form
  * Added a simple settings system.
  * Now using `@curveball/problem` for error handling.
  +* Added support for resource-specific privileges, allowing users to store
  + privileges based on arbitrary urls.
  0.5.0 (2019-05-02)
  