Travis-CI - upgrade docker-engine and allow downgrades #649
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This PR upgrades
docker-engine
in Travis-CI from1.12.1
to1.12.3
and adds the--allow-downgrades
flag. Without this flag, when1.12.4
comes out,apt-get
will fail with an error because it does not allow automated downgrades of packages without confirmation, so all builds will start to fail (this just happened in #590 ).