Downgrade Bundler on Travis
Downgrade Bundler on Travis

Bundler 2.0.1 works with Rails, but [the released version of
bundler-audit hardcodes a dependency on 1.x]. [Downgrade Bundler on Travis]
until [the new bundler-audit] is out.

[the released version of bundler-audit hardcodes a dependency on 1.x]: https://github.com/rubysec/bundler-audit/issues/202
[Downgrade Bundler on Travis]: https://docs.travis-ci.com/user/languages/ruby/#bundler-20
[the new bundler-audit]: https://github.com/rubysec/bundler-audit/pull/203

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