Update README

index.js

@@ -121,7 +121,7 @@ function connectLndhub () {
     if (connected) {
       console.log("Connected to Lndhub");
       // automatically refresh auth token once a day
-      setInterval(() => lndhub.reauth(), 86400000);
+      setInterval(lndhub.reauth, 86400000);
     } else {
       process.exit(1);
     }

lib/lndhub.js

@@ -22,7 +22,7 @@ export default class Lndhub {
   async handleErroredRequest (result, retryFunction, args=[]) {
     console.warn('API request failed:', result.message);
     if (result.code === 1) {
-      return this.reauth().then(connected => {
+      return this.reauth().bind(this).then(connected => {
         if (connected) {
           console.warn('Lndhub reconnected, trying again...');
           return this[retryFunction](...args);
@@ -68,7 +68,8 @@ export default class Lndhub {
     let data = await this.callEndpoint('post', '/v2/invoices', payload);
 
     if (data.error) {
-      return this.handleErroredRequest(data, 'createInvoice', Array.from(arguments));
+      return this.handleErroredRequest(data, 'createInvoice',Array.from(arguments))
+                 .bind(this);
     } else {
       return data;
     }
@@ -78,7 +79,8 @@ export default class Lndhub {
     const data = await this.callEndpoint('get', `/v2/invoices/${paymentHash}`);
 
     if (data.error) {
-      return this.handleErroredRequest(data, 'getInvoice', Array.from(arguments));
+      return this.handleErroredRequest(data, 'getInvoice', Array.from(arguments))
+                 .bind(this);
     } else {
       return data;
     }