Release 0.9.0

Add new behavior in non-Classic environments, plus some cleanup. Closes #145. [@kentquirk]

• Bump cobra to v1.4.0 - closes #143
• Bump beeline to v1.8.0
• Bump libhoney to v1.15.8
• Use cobra.MatchAll instead of identical custom code
• Clean up buildURL function to construct URLs more safely
• The service_name field is mirrored to service.name
• Detect classic key and change behavior for non-classic mode:
  • Service Name, if specified, is used as the dataset as well as both service_name and service.name fields.
  • If dataset is specified and service name is not, it will be used but will generate a warning (except in quiet mode).
  • If both are specified, service name will be used, dataset is ignored, and a warning will be emitted (except in quiet mode).
  • The command name is now sent as command_name (in classic it is still sent as service_name).
  • The watch command now sets the name field to merely watch rather than a high-cardinality value, making it easier to aggregate queries across different builds.
  • Dataset name is trimmed of leading/trailing whitespace; if any was found emits a warning (except in quiet mode)

Full Changelog: v0.8.0...v0.9.0