1.0.2   2015-11-10
	* use direct TLS and port 853 by default
	* TCP with STARTTLS as option

1.0.1   2015-05-29
	* fix a bug of setting listening IP address

1.0     2015-05-28
	* completely rewrite the code with libevent
	* support TCP (with STARTTLS) and direct TLS
	* remove the support for UDP queries to avoid being used for amplification
	* support persistent connection with given timeout

0.1     2014-04-02
	* first release
