eTag support for Channel and User metadata + callback fix (#113)

* eTag support for Channel and User metadata

* Fix status callback for subscription changes

Author: jakub-grzesiowski

.pubnub.yml

@@ -1,6 +1,13 @@
 --- 
-version: v8.0.1
+version: v8.1.0
 changelog:
+  - date: 2025-02-04
+    version: v8.1.0
+    changes:
+      - type: feature
+        text: "Added new optional parameter IfMatchesEtag for setUUIDMetadata and setChannelMetadata. When provided, the server compares the argument value with the eTag on the server and if they don't match a HTTP 412 error is returned."
+      - type: bug
+        text: "Fixes issue of not getting PNSubscriptionChangedCategory status when subscription change happens."
   - date: 2025-01-20
     version: v8.0.1
     changes:
@@ -748,7 +755,7 @@ sdks:
             distribution-type: package
             distribution-repository: git release
             package-name: PubNub.unitypackage
-            location: https://github.com/pubnub/unity/releases/download/v8.0.1/PubNub.unitypackage
+            location: https://github.com/pubnub/unity/releases/download/v8.1.0/PubNub.unitypackage
             requires:
               -
                 name: "UnityEditor"
@@ -915,7 +922,7 @@ sdks:
             distribution-type: package
             distribution-repository: git release
             package-name: PubNub.unitypackage
-            location: https://github.com/pubnub/unity/releases/download/v8.0.1/PubNub.unitypackage
+            location: https://github.com/pubnub/unity/releases/download/v8.1.0/PubNub.unitypackage
             requires:
               -
                 name: "UnityEditor"