v6.0.0

• Initial support for Rails 6.
• Added support for spatial features.
• Add a telemetry query on start-up. This helps the Cockroach Labs team
  prioritize support for the adapter. It can be disabled by setting the
  disable_cockroachdb_telemetry configuration option to false.
• Improved connection performance by refactoring an introspection
  that loads types.
• Added a configuration option named use_follower_reads_for_type_introspection.
  If true, it improves the speed of type introspection by allowing potentially stale
  type metadata to be read. Defaults to false.