Update outdated packages

package.json

 {
   "name": "onesignal-node",
-  "version": "1.1.2",
+  "version": "1.2.0",
   "description": "A Node.js Library for OneSignal push notification service",
   "main": "./lib/index.js",
   "scripts": {
@@ -25,9 +25,9 @@
   "homepage": "https://github.com/zeyneloz/onesignal-node.git#readme",
   "devDependencies": {
     "chai": "^4.1.2",
-    "mocha": "^3.5.3"
+    "mocha": "^5.2.0"
   },
   "dependencies": {
-    "request": "^2.85.0"
+    "request": "^2.87.0"
   }
 }