[VOL-2163] Supporting Async request

Introduces InvokeAsyncRPC to support aynchronous requests

Change-Id: Ica947a30140605d46518aa6c73f6661c0645ce92
diff --git a/VERSION b/VERSION
index 25875f0..3e4a61b 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-3.0.19
+3.0.20