Configurable api version, updated dependencies, updated OAuth usage a…

…nd code syntax update to use ES6 feats

example.js

@@ -1,28 +1,30 @@
 // initialize the express application
-var express = require("express"),
-    app = express();
+const express = require("express");
+const app = express();
 
 // initialize the Fitbit API client
-var FitbitApiClient = require("fitbit-node"),
-    client = new FitbitApiClient("YOUR_CLIENT_ID", "YOUR_CLIENT_SECRET");
+const FitbitApiClient = require("fitbit-node");
+const client = new FitbitApiClient({
+	clientId: "YOUR_CLIENT_ID",
+	clientSecret: "YOUR_CLIENT_SECRET",
+	apiVersion: '1.2' // 1.2 is the default
+});
 
 // redirect the user to the Fitbit authorization page
-app.get("/authorize", function (req, res) {
-    // request access to the user's activity, heartrate, location, nutrion, profile, settings, sleep, social, and weight scopes
-    res.redirect(client.getAuthorizeUrl('activity heartrate location nutrition profile settings sleep social weight', 'YOUR_CALLBACK_URL'));
+app.get("/authorize", (req, res) => {
+	// request access to the user's activity, heartrate, location, nutrion, profile, settings, sleep, social, and weight scopes
+	res.redirect(client.getAuthorizeUrl('activity heartrate location nutrition profile settings sleep social weight', 'YOUR_CALLBACK_URL'));
 });
 
 // handle the callback from the Fitbit authorization flow
-app.get("/callback", function (req, res) {
-    // exchange the authorization code we just received for an access token
-    client.getAccessToken(req.query.code, 'YOUR_CALLBACK_URL').then(function (result) {
-        // use the access token to fetch the user's profile information
-        client.get("/profile.json", result.access_token).then(function (results) {
-            res.send(results[0]);
-        });
-    }).catch(function (error) {
-        res.send(error);
-    });
+app.get("/callback", (req, res) => {
+	// exchange the authorization code we just received for an access token
+	client.getAccessToken(req.query.code, 'YOUR_CALLBACK_URL').then(result => {
+		// use the access token to fetch the user's profile information
+		client.get("/profile.json", result.access_token).then(results => {
+			res.send(results[0]);
+		});
+	}).catch(res.send);
 });
 
 // launch the server