Updated change-log.

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

changes.txt

@@ -14,4 +14,5 @@ Changes for 3.1:
 	- Moved more stuff into application/start
 	- Removed error.display config options.
 	- Added foreign key support to schema builder.
-	- Postgres "unique" indexes are now added with ADD CONSTRAINT
+	- Postgres "unique" indexes are now added with ADD CONSTRAINT
+	- Added "Event::until" method.