travis-ci: Enable stretch (the future Debian 9), replacing unstable
My goal in building ostree for Debian unstable was that we would
have good coverage of "new code" paths. However, it was removed
for #571 as too much of a moving target. Debian testing is less of
a moving target, and in particular is always internally consistent
(packages are co-installable), which Debian unstable is not guaranteed
to be.
Debian 'stretch' is the future Debian 9, which should be released
next year.
Signed-off-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Closes: #600
Approved by: cgwalters
projects / ostree.git / commit