*Add heartbeat check for every heartbeat received

src/index.ts

@@ -333,6 +333,7 @@ export default class DHTCache extends EventEmitter {
       });
 
       this._setEntity(bufId as Buffer, { heartbeat: Date.now() });
+      this._heartbeatCheck();
 
       this.log.debug(`Heartbeat received from ${bufId.toString("hex")}`);
     }