add composer files to gitignore

Author: notslang

.gitignore

@@ -1,13 +1,2 @@
-.htaccess
-wp-config.php
-wp-content/uploads/
-wp-content/blogs.dir/
-wp-content/upgrade/
-wp-content/backup-db/
-wp-content/advanced-cache.php
-wp-content/wp-cache-config.php
-sitemap.xml
-*.log
-wp-content/cache/
-wp-content/backups/
-sitemap.xml.gz
+/vendor/
+*.lock