remove npm ls [skip ci]

package.json

@@ -48,7 +48,6 @@
     "mocha": "^5.2.0"
   },
   "scripts": {
-    "prepublishOnly": "npm ls",
     "install": "node-pre-gyp install --fallback-to-build",
     "pretest": "node test/support/createdb.js",
     "test": "mocha -R spec --timeout 480000"