Release kubernetes-service 1.1.8

Change-Id: Idc304440ae72576a346bee4be46063938adf3cbc
diff --git a/VERSION b/VERSION
index 0659a5b..18efdb9 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.1.8-dev
+1.1.8