changelog entries for middleware fork (#22)

receiver/middleware-changelog.md

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+k8seventsreceiver:
+    custom static log added to show "k8s.cluster" entry
+
+k8sclusterreceiver:
+    bug-fix:
+        k8s.namespace.name -- value correction 
+
+kubeletstatsreceiver:
+    new-fields:
+        attribute:
+            k8s.node.uid
+
+dockerstatsreceiver:
+     new-fields:
+        attributes:
+            container.started_on
+        metric:
+            container.status
+
+hostmetricsreceiver:
+    new-fields:
+        attributes:
+            process.started_on
+        metric:
+            system.disk.io.speed
+            system.network.io.bandwidth
+            process.memory.percent
+            process.cpu.percent
+    new-feature:
+        avoid_selected_errors flag added -- to hide non-relevant errors
+
+fluentforwardreciever:
+    bug-fix:
+        uint64 timestamp handled