perf(integrations): retrieve balances in parallel, via Promise.all() (#…

…15)

* Use Promise.all() for integrations
* Reset portfolio on start

src/index.js

@@ -9,8 +9,10 @@ const settings = require('../settings.json')
 async function refreshPortfolio() {
   return new Promise(async (resolve) => {
         try {
+          Portfolio.clear()
           await Coinmarket.init()
           let integrations = {}
+          let promises = [];
 
           for (let account in settings.accounts) {
             let name = Utils.capitalize(account)
@@ -23,14 +25,15 @@ async function refreshPortfolio() {
             try {
               if (settings.accounts[account] && settings.accounts[account].length > 0) {
                 console.log(`Retrieving ${name} balance...`)
-                let coins = await integrations[name].default.getBalance()
-                await Portfolio.addCoins(coins)
+                promises.push(integrations[name].default.getBalance().then(coins => Portfolio.addCoins(coins)))
               }
             } catch (e) {
               console.log(`Error: An error occured while running integration: ${name}, ${e}`)
             }
           }
 
+          await Promise.all(promises);
+
           for (let index in settings.otherHoldings) {
             if (settings.otherHoldings.hasOwnProperty(index)) {
               let otherHolding = settings.otherHoldings[index]