Update 18.01 Release Notes

Change-Id: Id2f13c59c6f4e7bc79f6e77d6dab752bf6dfb06a
Signed-off-by: Dave Wallace <dwallacelf@gmail.com>
(cherry picked from commit a1a382bb2bc2fbf6bf947a24a263fefbe32497e7)
diff --git a/RELEASE.md b/RELEASE.md
index 707fb95..7543d77 100644
--- a/RELEASE.md
+++ b/RELEASE.md
@@ -51,6 +51,7 @@
   - VPP TCP Stack scale / congestion improvements
   - Refactor UDP
   - Namespace support
+  - Session rules table
   - VPP Comms Library (VCL) improvements
 
 - ACL