fix(invoice): only notify on settled invoices

Fix a bug where we were incorrectly notifying users that an invoice had
been successfully paid when it had actually just been created.

Fix #670

app/reducers/invoice.js

@@ -136,12 +136,14 @@ export const invoiceUpdate = (event, { invoice }) => dispatch => {
   // Fetch new balance
   dispatch(fetchBalance())
 
+  if (invoice.settled) {
     // HTML 5 desktop notification for the invoice update
     const notifTitle = "You've been Zapped"
     const notifBody = 'Congrats, someone just paid an invoice of yours'
 
     showNotification(notifTitle, notifBody)
   }
+}
 // ------------------------------------
 // Action Handlers
 // ------------------------------------