fix: upgrade npm from 6.13.0 to 6.13.1

Snyk has created this PR to upgrade npm from 6.13.0 to 6.13.1.

See this package in NPM:
https://www.npmjs.com/package/npm

See this project in Snyk:
https://app.snyk.io/org/jrtnq514/project/47811b04-f83d-4436-8311-ee5a921ddcad?utm_source=github&utm_medium=upgrade-pr

Author: snyk-bot

package-lock.json

@@ -23,7 +23,7 @@
   },
   "homepage": "https://github.com/jrtnq514/vue-user-timeout#readme",
   "dependencies": {
-    "npm": "^6.13.0"
+    "npm": "^6.13.1"
   },
   "devDependencies": {
     "@babel/core": "^7.7.2",