v0.4.0

• Includes a re-pin of opencensus, greatly reducing the transitive
  dependency list.
• Deletes photoslibrary/v1. The photoslibrary team hopes to fully support Go in
  the near future, but this autogenerated library is ready to be sunset. If you
  rely on this client, please vendor this library at v0.3.2.
• Various updates to autogenerated clients.

Please note: the release version is not indicative of an individual client's
stability or version.