[#3198] add ChangeLog entry

Author: andrei-pavel

ChangeLog

@@ -1,3 +1,10 @@
+2201.	[func]		andrei
+	To facilitate setting multiple option-data entries with same code
+	and space, but different data, the set of keys for the
+	option-data list was extended with the "data" leaf in YANG
+	modules.
+	(Gitlab #3198)
+
 2200.	[func]		piotrek
 	Kea now supports new DHCPv4 option code 121, Classless Static
 	Route option defined in RFC 3442.