Bumped version to 5.4.1 (#98)

Author: hiranya911

npm-shrinkwrap.json

@@ -1,6 +1,6 @@
 {
   "name": "firebase-admin",
-  "version": "5.4.0",
+  "version": "5.4.1",
   "description": "Firebase admin SDK for Node.js",
   "author": "Firebase <firebase-support@google.com> (https://firebase.google.com/)",
   "license": "Apache-2.0",
@@ -53,6 +53,7 @@
     "@google-cloud/firestore": "~0.8.1",
     "@types/google-cloud__storage": "^1.1.1",
     "@types/jsonwebtoken": "^7.1.33",
+    "@types/node": "^8.0.32",
     "faye-websocket": "0.9.3",
     "jsonwebtoken": "7.1.9",
     "node-forge": "0.7.1",
@@ -65,7 +66,6 @@
     "@types/lodash": "^4.14.38",
     "@types/mocha": "^2.2.32",
     "@types/nock": "^8.0.33",
-    "@types/node": "^8.0.32",
     "@types/request": "0.0.32",
     "@types/request-promise": "^4.1.33",
     "@types/sinon": "^1.16.31",