travis: Upgrade to stack snapshot lts-7.9 #435
Merged
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We are using
nightly-2016-07-17
for too long, and the newer snapshots have more packages and more updated versions.Considering that now nightly and lts are both using GHC-8.0.1, is makes sense to switch back to a lts snapshot.
This change will allow users to use more updated packages and also possibly avoid some incompatibilities when using packages that are not in Stackage.