v1.7.0

Added

• New languages available: Indonesian ('id') and Turkish ('tr'). Add language code constants and tests.

  Note: older library versions also support the new languages, this update only adds new code constants.

• Add limit_reached and any_limit_reached properties to Usage object
  returned by get_usage().

• Add Translator.translate_document_wait_until_done() to poll translation
  status until translation is complete or fails.

• Add auth_key_is_free_account() utility function.

Changed

• Improve readme usage examples.

Deprecated

• Deprecate limit_exceeded and any_limit_exceeded properties of Usage
  object returned by get_usage(), use limit_reached and any_limit_reached
  instead.