use file.end() instead of file.close()

This is the officially supported non breaking API

Author: iddan

lib/download-asset.js

@@ -32,7 +32,7 @@ export default function downloadAsset (url, directory) {
       response.pipe(file)
 
       file.on('finish', function () {
-        file.close()
+        file.end()
         resolve(localFile)
       })
     })