Extract a source .gz archive to a specified destination file.
npm install gunzip-file
npm install gunzip-file
`

Usage
Pass a source .gz file and a destination file and the .gz will be extracted to the target file.
` js
gunzip('example.json.gz', 'example.json');
`
Additionally, you can pass a callback that will be executed when the extraction has completed.
` js
gunzip('example.json.gz', 'example.json', function() {
console.log('This is called when the extraction is completed.');
});
``