Update contexthub OWNERS

Test: n/a
Change-Id: I2d23999f1dccf91cfcb21e612740f67f7beb7e58
diff --git a/contexthub/1.0/vts/functional/OWNERS b/contexthub/1.0/vts/functional/OWNERS
index ee01441..045cc4e 100644
--- a/contexthub/1.0/vts/functional/OWNERS
+++ b/contexthub/1.0/vts/functional/OWNERS
@@ -1,8 +1,7 @@
 #Context Hub team
-aarossig@google.com
 arthuri@google.com
 bduddie@google.com
-bstack@google.com
+stange@google.com
 
 #VTS team
 yim@google.com