v0.42.0

• bigtable:
  • Add an admin method to update an instance and clusters.
  • Fix bttest regex matching behavior for alternations (things like |a).
  • Expose BlockAllFilter filter.
• bigquery:
  • Add Routines API support.
• storage:
  • Add read-only Bucket.LocationType.
• logging:
  • Add TraceSampled to Entry.
  • Fix to properly extract {Trace, Span}Id from X-Cloud-Trace-Context.
• pubsub:
  • Add Cloud Key Management to TopicConfig.
  • Change ExpirationPolicy to optional.Duration.
• automl:
  • Add apiv1beta1 client.
• iam:
  • Fix compilation problem with iam/credentials/apiv1.