Deleting the ZIP file if it already exists
Deleting the ZIP file if it already exists

Since "archiver" will just just append new files to the ZIP file if it already exists, it should be deleted first. The best solution would be to tell "archiver" to overwrite the ZIP file if it already exists, but I'm not sure how to do that.

abjerner/grunt-umbraco-package,tomfulton/grunt-umbraco-package