android 9.0

Change-Id: I1bbf37398bb491b1b150f7902fe1d5004d417e67
diff --git a/build/tools/roomservice.py b/build/tools/roomservice.py
index 89efcba..84c67e8 100755
--- a/build/tools/roomservice.py
+++ b/build/tools/roomservice.py
@@ -38,7 +38,7 @@
 # set this to the default remote to use in repo
 default_rem = "omnirom"
 # set this to the default revision to use (branch/tag name)
-default_rev = "android-8.1"
+default_rev = "android-9.0"
 # set this to the remote that you use for projects from your team repos
 # example fetch="https://github.com/omnirom"
 default_team_rem = "omnirom"