Create Dependabot config file

[dependabot-preview]

👋 Dependabot is moving natively into GitHub! This pull request migrates your configuration from Dependabot.com to a config file, using the new syntax. When you merge this pull request, we'll swap out dependabot-preview (me) for a new dependabot app, and you'll be all set!

With this change, you'll now use the Dependabot page in GitHub, rather than the Dependabot dashboard, to monitor your version updates. Dependabot is now configured exclusively using config files.

If you've got any questions or feedback for us, please let us know by creating an issue in the dependabot/dependabot-core repository.

Learn more about the relaunch of Dependabot

Please note that regular @dependabot commands do not work on this pull request.

🤖💛

[coveralls]

Pull Request Test Coverage Report for Build 1498

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 7 unchanged lines in 4 files lost coverage.
• Overall coverage decreased (-0.05%) to 89.537%

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Files with Coverage Reduction	New Missed Lines	%
PathPlanning/DubinsPath/dubins_path_planning.py	1	95.28%
PathPlanning/ReedsSheppPath/reeds_shepp_path_planning.py	1	96.51%
PathPlanning/RRTStarReedsShepp/rrt_star_reeds_shepp.py	1	79.86%
ArmNavigation/n_joint_arm_to_point_control/n_joint_arm_to_point_control.py	4	93.59%

Totals
Change from base Build 1496:	-0.05%
Covered Lines:	7445
Relevant Lines:	8315

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💛 - Coveralls