Update changelog. Bump version.

Author: brocaar

docs/config.toml

@@ -40,4 +40,4 @@ pygmentsUseClasses = true
     weight = 5
 
 [params]
-version = "3.0.0-test.1"
+version = "3.0.0-test.2"

docs/content/overview/changelog.md

@@ -37,6 +37,19 @@ It is also recommended to update your LoRa Server configuration file.
 See [Configuration](https://www.loraserver.io/loraserver/install/config/) for
 more information.
 
+## v2.8.1
+
+### Improvement
+
+#### Validate DevAddr on enqueue
+
+A `DevAddr` field has been added to the `MulticastQueueItem` API field.
+When this field is set, LoRa Server will validate that the current active
+security-context has the same `DevAddr` and if not, the API returns an error.
+
+This prevents enqueue calls after the device (re)joins but before the new
+`AppSKey` has been signalled to LoRa App Server.
+
 ## v2.8.0
 
 ### Features