message: start writing changelog now
diff: +0.4.0 / UNRELEASED
  +==================
  + * ResourceMap now contains the full Resource<T,U> struct rather than a tuple as the value. => `value.metadata` is available in the cache.
  +
  0.3.0 / 2019-05-09
  ==================
  * `Named` trait removed (inferring from metadata.name now)
  