2.0.0 - 21 July 2020
	* Add IPv6 support
	* environment variable attribute Framed-IP-Address when present
	  from Antonio Silva
	* add Management-Privilege-Level attribute support
	  from Deepak Kumar Bhagat
	* Honor radius prompt attribute during challenge response
	  From Koch
	* Add support for Linux VRF (SO_BINDTODEVICE), use per-server sockets if src_ip or vrf are requested
	* Use per-server socket if src_ip is set in config file
	  from Luca Boccassi
	* many other Linux fixes from Luca Boccassi.
	* Fix memory leak in add_nas_ip_address
	  from Matt Knutson
	* Add Calling-Station-Id to accounting requests.
	  from Thomas Liske
	* Thread safety fixes
	  from Samuel Varley
	* Many other fixes from Justin Standring, mweissen13, and Benny Siegert.
