Use new URL for currency API from cryptonator.

app/manifest.json

@@ -58,7 +58,7 @@
     "storage",
     "clipboardWrite",
     "http://localhost:8545/",
-    "https://www.cryptonator.com/"
+    "https://api.cryptonator.com/"
   ],
   "web_accessible_resources": [
     "scripts/inpage.js"

app/scripts/controllers/currency.js

@@ -45,7 +45,7 @@ class CurrencyController {
 
   updateConversionRate () {
     const currentCurrency = this.getCurrentCurrency()
-    return fetch(`https://www.cryptonator.com/api/ticker/eth-${currentCurrency}`)
+    return fetch(`https://api.cryptonator.com/api/ticker/eth-${currentCurrency}`)
     .then(response => response.json())
     .then((parsedResponse) => {
       this.setConversionRate(Number(parsedResponse.ticker.price))