Bump version 2.0

package-lock.json

 {
   "name": "onesignal-node",
-  "version": "1.2.0",
+  "version": "2.0.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {

package.json

 {
   "name": "onesignal-node",
-  "version": "1.2.0",
+  "version": "2.0.0",
   "description": "A Node.js Library for OneSignal push notification service",
   "main": "./lib/index.js",
   "scripts": {