Bump dependabot-omnibus from 0.87.13 to 0.88.1

Bumps dependabot-omnibus from 0.87.13 to 0.88.1.

Changelog

Sourced from dependabot-omnibus's changelog.

v0.88.1, 9 January 2019

• Better handling of directories in changelog finder

v0.88.0, 9 January 2019

• Elixir reorg

v0.87.15, 9 January 2019

• PHP: Raise resolvability issue when working with local VCS errors
• Bump @dependabot/yarn-lib from 1.12.3 to 1.13.0 in /helpers/yarn

v0.87.14, 9 January 2019

• Handle Bitbucket 401s during changelog lookup
• Handle Bitbucket 401s during commit lookup

Commits

• 380dcfb v0.88.1
• 8e21ab1 Better handling of directories in changelog finder
• c1ba50f v0.88.0
• ae4744d Fix error text in test
• 4f796fa Merge branch 'elixir-reorg'
• f95121e Add hex build script
• c3bd320 PHP: Clearer error message when an extension is missing
• 826df79 Fix elixir helpers in Docker container
• 8ac8554 Close tags when truncating lines
• d9cccef v0.87.15
• Additional commits viewable in compare view