Use new healthcheck API from kredits-contracts

This uses console.error to log the healthcheck error.

app/routes/application.js

@@ -8,6 +8,10 @@ export default Route.extend({
     const kredits = this.kredits;
 
     return kredits.setup().then(() => {
+      kredits.get('kredits').healthcheck().catch((error) => {
+        console.error('Kredits healthcheck failed!');
+        console.error(error);
+      });
       if (kredits.get('accountNeedsUnlock')) {
         if (confirm('It looks like you have an Ethereum wallet available. Please unlock your account.')) {
           transition.retry();

package-lock.json

@@ -13456,7 +13456,7 @@
       }
     },
     "kredits-contracts": {
-      "version": "github:67P/truffle-kredits#b6bc5af7bf4c9b7aded6a032bd7acb0bd57e475d",
+      "version": "github:67P/truffle-kredits#ee886e6cd08e2d7ef0c3e1c5952a15c918d20224",
       "dev": true,
       "requires": {
         "ethers": "3.0.15",