dhcp-host selection fix for v4/v6.

Avoid treating a --dhcp-host which has an IPv6 address
as eligable for use with DHCPv4 on the grounds that it has
no address, and vice-versa.
diff --git a/CHANGELOG b/CHANGELOG
index cc6ee69..a5b2c44 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -14,6 +14,12 @@
 	sorts before v2.83test1. This fixes the problem which lead
 	to 2.84 announcing itself as 2.84rc2.
 
+	Avoid treating a --dhcp-host which has an IPv6 address
+	as eligable for use with DHCPv4 on the grounds that it has
+	no address, and vice-versa. Thanks to Viktor Papp for
+	spotting the problem. (This bug was fixed was back in 2.67, and
+	then regessed in 2.81).
+	
 	
 version 2.84
 	Fix a problem, introduced in 2.83, which could see DNS replies