[PATCH 2/2] release: use xz compression

[Daniel Kahn Gillmor]

On Tue 2019-03-19 07:08:19 -0300, David Bremner wrote:
> This produces tarballs that are roughly 30% smaller.

LGTM.  I can confirm that i'm seeing tarball sizes go from 924543 bytes
(or 917179 bytes with gzip -9) to 644892 bytes with this xz approach.

I think the ecosystem that notmuch targets *can* handle .xz these days,
too.

  --dkg
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