Version history
---------------
+[0.2.3] - 2019-12-18
+
+* Implement Protobuf schema for following X2AP messages:
+
+ * SGNB CHANGE REQUIRED
+ * SGNB CHANGE CONFIRM
+ * SGNB CHANGE REFUSE
+ * SGNB ACTIVITY NOTIFICATION
+ * GNB STATUS INDICATION
+
[0.2.2] - 2019-11-14
* Add mandatory documentation files.