Update koan submodule pointer.

data/schema.sql

@@ -4,7 +4,7 @@ CREATE TABLE version_history(
   from_version INTEGER NOT NULL,
   to_version INTEGER NOT NULL,
   author TEXT NOT NULL,
-  _timestamp TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  _timestamp TIMESTAMPTZ NOT NULL DEFAULT NOW()
 );
 INSERT INTO version_history (component, from_version, to_version, author) VALUES ('ROOT', 0, 1, 'Initial Creation');