fix: totalEntries is not defined

Update zipFile.js, declaring totalEntries variable using 'let' keyword.

resolv: #534

zipFile.js

@@ -294,7 +294,7 @@ module.exports = function (/*Buffer|null*/ inBuffer, /** object */ options) {
 
  mainHeader.size = 0;
  mainHeader.offset = 0;
- totalEntries = 0;
+ let totalEntries = 0;
 
  for (const entry of this.entries) {
  // compress data and set local and entry header accordingly. Reason why is called first