chore: remove unused close parameter

Author: jeswr

asynciterator.ts

@@ -1315,7 +1315,7 @@ export class MappingIterator<T, D = T> extends AsyncIterator<D> {
     return null;
   }
 
-  map<K>(map: (item: D, it: AsyncIterator<any>) => K | null, self?: any, close?: boolean): AsyncIterator<K> {
+  map<K>(map: (item: D, it: AsyncIterator<any>) => K | null, self?: any): AsyncIterator<K> {
     return new MappingIterator<T, K>(this.source, [bind(map, self), ...this.transforms], this);
   }