Changelog for s6-portable-utils.

In 2.2.1.0
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 - s6-ln now accepts the non-standard -n option, with a meaning
similar to the one in GNU ln. This is used to atomically update
symbolic links to directories.


In 2.2.0.0
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 - Added this NEWS file. :)
 - Major types overhaul to make them more POSIXly correct:
compatibility with skalibs-2.5.0.0.