Upgrade to latest version of SDK

Author: gnongsie

package.json

@@ -4,7 +4,7 @@
   "description": "Sample code for nodejs sdk",
   "main": "constants.js",
   "dependencies": {
-    "authorizenet": "^1.0.7",
+    "authorizenet": "^1.0.8",
     "chai": "^3.5.0",
     "eslint": "^4.18.2",
     "yarn": "^1.22.10"