Release 0.8.0

Added

• dbt version detection: palm can now detect the version of dbt used in a project
  and will add the version to the plugin config. This can then be used to support
  changes between dbt versions.
• support for dbt's yaml selectors via the --selector option on relevant commands.

Changed

• Requires palm v2.6.0 or higher
• env vars are updated for projects running dbt v1.5.0 and later. This resolves
  deprecation warnings for people using more recent versions of dbt.