Update composer.md

`update --lock` is useful e.g. after resolving merge conflicts when the packages should stay at their current versions but the lock file hash is invalid and must be updated.
2018-07-30 09:01:18 +02:00 · 2018-07-30 09:01:18 +02:00 · 32301ff3da
parent e9ac8eb8f4
commit 32301ff3da
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--- a/composer.md
+++ b/composer.md
@ -30,6 +30,7 @@ All composer commands, depending on your install, may need to use `php composer.
 | ---                       | ---                             |
 | `composer update laravel` | Update a certain package        |
 | `composer update vendor/*`| Update all packages in a folder |
+| `composer update --lock`  | Update lock file hash without updating any packages |