Avoid Listener leaks by setting a max answer threshold

lib/types/Base.js

@@ -1,5 +1,7 @@
 import {EventEmitter} from 'events';
 
+const ANSWER_THRESHOLD = 10;
+
 /**
  * Base class of all classes
  */
@@ -43,7 +45,10 @@ export default class Base extends EventEmitter {
       }
 
       const chat = this.properties.chat_id;
+      let answers = 0;
       bot.on('update', function listener(result) {
+        answers += result.length;
+
         const update = result.find(({message}) => {
           // if in a group, there will be a reply to this message
           if (chat < 0) {
@@ -62,6 +67,10 @@ export default class Base extends EventEmitter {
 
           bot.removeListener('update', listener);
         }
+
+        if (answers >= ANSWER_THRESHOLD) {
+          bot.removeListener('update', listener);
+        }
       });
     });
   }