updated README to explain the connection::expected() method
updated README to explain the connection::expected() method

fantastory/AMQP-CPP,CopernicaMarketingSoftware/AMQP-CPP,CopernicaMarketingSoftware/AMQP-CPP,fantastory/AMQP-CPP,toolking/AMQP-CPP,toolking/AMQP-CPP