[openstreetmap/openstreetmap-website] Add static code checks in Travis CI (#2229)

[mmd]

@mmd-osm pushed 1 commit.

495b2cff1fde896183496bbc6c6091120e8063fc  Slience rubocop


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View it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/2229/files/ff0a7de648c208c9a056c15e0e4bf1109bf4ad19..495b2cff1fde896183496bbc6c6091120e8063fc
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