Add to upgrade guide.

taylorotwell · taylorotwell · commit 4c128e876034 · 2013-10-28T11:29:49.000-05:00
diff --git a/upgrade.md b/upgrade.md
@@ -2,5 +2,6 @@
 
 ## Upgrading From 4.0 to 4.1
 
+- `composer update`.
 - Replace `public/index.php`, `artisan.php`.
 - Add new `expire_on_close` option to `session` configuration file.
