Bump bundler-audit from 0.6.0 to 0.6.1

[dependabot-preview]

Bumps bundler-audit from 0.6.0 to 0.6.1.

Changelog

Sourced from bundler-audit's changelog.

0.6.1 / 2019-01-17

• Require bundler >= 1.2.0, < 3 to support [bundler] 2.0.

Commits

• c3fe695 Updated the copyright dates.
• 3d98794 Be more specific.
• c82e2d7 Updated the 0.6.1 release date.
• df7b170 Update ChangeLog for 0.6.1.
• 935e0cf Version bump to 0.6.1.
• 52fc137 Merge pull request #205 from eric-pigeon/master
• 58540bc Merge branch 'master' into master
• 485377f Match >= instead of =>.
• 9e3f9f9 Match the first version, then match comma separated versions.
• 2bfbe37 Also support four part version numbers in the Version: regexp line.
• Additional commits viewable in compare view

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