fix(index.js) Get decompressed data and detects the mime-type for web…

[danielmarcoto]

I used your code to unzip a static website generated by mkdocs in CodeBuild. So, I needed to update the code to:

1. Keep the full path of the file (to preserve the folders) using zipEntry.entryName;
2. Retrieve the decompressed data from zipEntry.getData();
3. Keep mime-type of the file on putting the file to S3 mime.lookup(zipEntry.name) (from dependency mime-types);

[carloscarcamo]

Hi @danielmarcoto, thanks for your contribution, I've been a little busy this days but, I will definitely check this PR, thanks again.