Add rateLimits to blockchain

src/index.ts

@@ -42,7 +42,12 @@ export class App {
         debug('Creating blockchain...');
         const blockchain = await BlockchainElectrum.from({
             store: blockchainCache,
-            servers: [ 'cashnode.bch.ninja' ]
+            servers: [ 'cashnode.bch.ninja' ],
+            rateLimit: {
+                concurrency: 100,
+                maxPerInterval: 100,
+                intervalMs: 100,
+            }
         });
 
         // Create the wallet for the app.