Bump dependabot-core from v0.75.46 to v0.75.51

Bumps dependabot-core from v0.75.46 to v0.75.51.

Changelog

Sourced from dependabot-core's changelog.

v0.75.51, 16 November 2018

• Handle changelogs which use a bullet point for each new version

v0.75.50, 16 November 2018

• Ruby: Prefer fetching gems.rb to Gemfile
• Python: decrease timeout from 500 to 360 seconds
• JS: Mute sub-dependency version resolve errors

v0.75.49, 15 November 2018

• Python: Set higher timeout for Pipenv

v0.75.48, 15 November 2018

• Python: Clean up Pipenv error handling

v0.75.47, 15 November 2018

• Python: Raise original error correctly depending on Python version in use
• Maven: Fix DeclarationFinder when looking up declaration in a pom with missing properties

Commits

• 3cc332c v0.75.51
• d2068e5 Handle bullet point changelogs
• fd0ec0f v0.75.50
• 9ed623b Merge pull request #782 from dependabot/handle-sub-dependency-errors
• cd5276e Ruby: Prefer fetching gems.rb to Gemfile
• 04826c7 6 minutes is 360 seconds, not 500 seconds
• 63e077e v0.75.49
• 899520a Python: Set higher timeout for Pipenv
• 706f144 v0.75.48
• 5f52022 Python: Clean up Pipenv error handling
• Additional commits viewable in compare view