0.5.0

• All carapax-* crates was merged into one carapax crate.
  Now you need to enable a corresponding feature in order
  to get access to features provided by those crates.
• Added Dispatcher::set_error_handler method.
  Introduced LoggingErrorHandler as default error handler.
  Now ErrorPolicy is available in public API.
  So that you can easily override error handler and/or change update propagation behavior.
• seance dependency was upgraded to 0.3 version.
• Added dialogues support.
• HandlerError now is a type alias for Box<dyn Error>.
• CommandDispatcher was removed, use #[handler(command = "/name")] instead.
• #[handler] proc macro emits a clear error message when function is not async.
• Value of command argument in #[handler] proc macro now always requires a leading slash.
• Use TryFrom/TryInto when converting an Update to SessionId.
  We must be sure that SessionId always contains chat_id and user_id in order to prevent bugs.
• Command type was moved to types module.
• Added tgbot 0.7.0 support.