Add dependabot configuration

[yeikel]

See https://github.blog/2020-06-01-keep-all-your-packages-up-to-date-with-dependabot/

[changeset-bot[bot]]

⚠️ No Changeset found

Latest commit: 3016d0f6b0de411bcd7fca989f65c9125053306b

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[codecov[bot]]

Codecov Report

Merging #374 (3016d0f) into master (5615e7d) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #374   +/-   ##
=======================================
  Coverage   99.17%   99.17%           
=======================================
  Files           6        6           
  Lines         121      121           
  Branches       37       37           
=======================================
  Hits          120      120           
  Misses          1        1           

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