fix(package): update validator to version 9.0.0

Closes #108

Author: greenkeeper[bot]

package.json

@@ -37,7 +37,7 @@
     "travis-ci": "^2.1.1",
     "update-notifier": "^2.3.0",
     "user-home": "^2.0.0",
-    "validator": "^6.1.0"
+    "validator": "^9.0.0"
   },
   "optionalDependencies": {
     "keytar": "^4.0.4"