Activate the GitHub App Stale on the GitHub repository

[johlju]

Pull Request (PR) description

This Pull Request (PR) fixes the following issues:

Task list:

• Change details added to Unreleased section of CHANGELOG.md?
• Added/updated documentation, comment-based help and descriptions in .schema.mof files where appropriate?
• Examples appropriately updated?
• New/changed code adheres to Style Guidelines?
• Unit and (optional) Integration tests created/updated where possible?

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This change is 

[codecov-io]

Codecov Report

Merging #166 into dev will not change coverage.
The diff coverage is n/a.

@@        Coverage Diff         @@
##           dev   #166   +/-   ##
==================================
  Coverage   90%    90%           
==================================
  Files        7      7           
  Lines      691    691           
==================================
  Hits       623    623           
  Misses      68     68

[PlagueHO]

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Reviewed 1 of 1 files at r1.
Review status: complete! all files reviewed, all discussions resolved

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Comments from Reviewable