1.18.0

• Updated bundletool help to include all commands.
• Open-sourced the code which is used for building APKs with build-mode
  ARCHIVE.
• Implemented support for device group targeting.
• Bundles which use device groups can include a config file
  containing the definitions, passed as the bundle metadata file
  DeviceGroupConfig.json or DeviceGroupConfig.pb in the
  com.android.tools.build.bundletool namespace. If the metadata is present,
  it must define all device groups referenced in the bundle. Device groups
  will be matched in the order that they are defined. A catch-all group
  other is automatically added to the end of the list, to support any
  devices which aren't matched by any of the metadata-defined groups.
• Fixed resource remapping for runtime-enabled SDKs.
• Added additional information to DeviceSpec, for evaluating device group
  membership.