Update flask

diff --git a/coffee-flask b/coffee-flask
index 9f72dd97bf56d6f21b06faf92db8e35bcde9d417..c0aa8ce3d887a2553ada3177b6a1f645f5a703a9 160000 (submodule)
--- a/coffee-flask
+++ b/coffee-flask
@@ -1 +1 @@
-Subproject commit 9f72dd97bf56d6f21b06faf92db8e35bcde9d417
+Subproject commit c0aa8ce3d887a2553ada3177b6a1f645f5a703a9