0.2.0

Updated ZIPFoundation dependency.

Breaking Changes

• The ArchiveFileDistribution and ArchiveDataDistribution initializers no
  longer return nil if the archive could not be read; instead, they rethrow
  the error thrown by ZIPFoundation.
• The ArchiveFileDownloader and ArchiveDataDownloader's load methods no
  longer throw Error.badData; instead they rethrow the error thrown by
  ZIPFoundation.