bump version to 17.11.0-ce-rc4

Signed-off-by: Eli Uriegas <eli.uriegas@docker.com>
diff --git a/VERSION b/VERSION
index 67b0c1d..e2d9425 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-17.11.0-ce-rc3
+17.11.0-ce-rc4