[openstreetmap/openstreetmap-website] travis: change dist to bionic (#2473)

[mmd]

We're using bionic in production, so I figured it would be good to do so in CI, too.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/2473

-- Commit Summary --

  * travis: change dist to bionic

-- File Changes --

    M .travis.yml (2)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/2473.patch
https://github.com/openstreetmap/openstreetmap-website/pull/2473.diff

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