Add changes file for multi concurrency feature

Author: normj

.autover/changes/8cdca44b-11fc-41ad-aa31-3448cd3309e5.json

@@ -0,0 +1,18 @@
+{
+  "Projects": [
+    {
+      "Name": "Amazon.Lambda.Core",
+      "Type": "Minor",
+      "ChangelogMessages": [
+        "Add LambdaTraceProvider to make the current trace id globally accessible"
+      ]
+    },
+    {
+      "Name": "Amazon.Lambda.RuntimeSupport",
+      "Type": "Minor",
+      "ChangelogMessages": [
+        "Add support for Lambda multi concurrency mode"
+      ]
+    }	
+  ]
+}