fix(package): update registry-auth-token to version 4.0.0

Author: greenkeeper[bot]

package.json

@@ -34,7 +34,7 @@
     "npm": "^6.8.0",
     "rc": "^1.2.8",
     "read-pkg": "^5.0.0",
-    "registry-auth-token": "^3.3.1"
+    "registry-auth-token": "^4.0.0"
   },
   "devDependencies": {
     "ava": "^2.0.0",