Update discord info in OWNERS file

Signed-off-by: austinfcui <austinfcui@gmail.com>
Change-Id: I8d3db38f30a7ad27400600cc62cc133eac690fd6
diff --git a/OWNERS b/OWNERS
index 870b4b2..05976a6 100644
--- a/OWNERS
+++ b/OWNERS
@@ -44,7 +44,7 @@
 openbmc:
 - name: Austin Cui
   email: austinfcui@gmail.com
-  discord: NA
+  discord: austinfcui#2519
 - name: Ben Tyner
   email: ben.tyner@ibm.com
   discord: bentyner