Composer: prevent a lock file from being created

Author: swissspidy

composer.json

@@ -26,7 +26,8 @@
     "allow-plugins": {
       "dealerdirect/phpcodesniffer-composer-installer": true,
       "johnpbloch/wordpress-core-installer": true
-    }
+    },
+    "lock": false
   },
   "extra": {
     "branch-alias": {