Updated change log.

Signed-off-by: Taylor Otwell <taylorotwell@gmail.com>

changes.txt

@@ -16,4 +16,5 @@ Changes for 3.1:
 	- Added foreign key support to schema builder.
 	- Postgres "unique" indexes are now added with ADD CONSTRAINT
 	- Added "Event::until" method.
-	- Added "memory" cache and session drivers.
+	- Added "memory" cache and session drivers.
+	- Added controller::detect method.