0.3

New Features

• #16 Implement reconnection logic.
• #16 Buffer outbound data when in a disconnected state.
• #16 Learn about new servers using the received INFO block.
• #16 Callback functions may be provided via the new
  Options::set_disconnect_callback and
  Options::set_reconnect_callback which will be executed
  when the connection to a server has been terminated
  or when a new connection has been established afterward.

Breaking Changes

• #11 Connection::new has been renamed Options::new.
• #13 The various iterators have been replaced with concrete
  implementations: Iter, IntoIter, TimeoutIter which
  ensure that the backing Subscription is not closed
  while they are in use.