Update request because ansi-styles 2.2.0 disappeared

npm ERR! fetch failed https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.0.tgz
npm WARN retry will retry, error on last attempt: Error: fetch failed with status code 404

https://github.com/chalk/ansi-styles/issues/15#issuecomment-202562321

package.json

@@ -41,7 +41,7 @@
     "passport-ldapjs": "^1.0.2",
     "readline-sync": "^1.4.6",
     "redis": "^2.6.5",
-    "request": "^2.69.0",
+    "request": "^2.81.0",
     "safetydance": "^0.1.1",
     "serve-index": "^1.8.0",
     "superagent": "^1.7.2",