Added Changelog

changelog.md

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+Changelog
+===========
+
+
+Release 6.4
+---
+
+
+* New Feature: Store spare notifications: if is arriving at the IoT Broker a notification related to a subscription not initiated by the IoT Broker, the data in the notification is stored historically
+
+* New Feature: Dispatch spare notification to active subscription: if is arriving at the IoT Broker a notification related to a subscription not initiated by the IoT Broker, the data in the notification is checked against active subscription and the interested subscriber notified.
+
+* Historical Agent 
+    * Registry: a component that gets as input ContextElement and issues NGSI-9 Registrations in case that the Entity associated to such ContextElement was not yet appeared before or has changed (e.g. Domain Metadata has changed).
+    * Optimized connection to CouchDB 
+    * Added cache
+
+* Miscellanea  
+    * Correct handling of strange character into messages
+    * Correct AttributeExpression behaviour
+    * Enabled correct restoring of subscription
+
+* Docker:
+    * Docker can be configured to use external databases (for permanent storage)
+
+* NGSI-v1.Orion version:
+    * Support to QueryContext
+    * Support to NotifyContextAvailability
+    * Support to SubscribeContext
+    * Support notifications to NGSI-v1.Orion interfaces