Merge pull request #6139 from yiisoft/add-composer-lock

.gitignore

@@ -19,9 +19,8 @@ Thumbs.db
 
 # composer itself is not needed
 composer.phar
-# composer.lock should not be committed as we always want the latest versions
-/composer.lock
-# composer.lock in applications is ignored in dev repo, will be committed in checked out app repos
+
+# composer.lock in applications is ignored since it's automatically created by composer when application is installed
 /apps/*/composer.lock
 
 # Mac DS_Store Files