Changelog + issue validation automation script !!!

[severinrudie]

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Pull Request checklist

• Quality: This PR builds and passes detekt/ktlint checks (A pre-push hook is recommended)
• Tests: This PR includes thorough tests or an explanation of why it does not
• Screenshots: This PR includes screenshots or GIFs of the changes made or an explanation of why it does not
• Accessibility: The code in this PR follows accessibility best practices or does not include any user facing features

After merge

• Milestone: Make sure issues finished by this pull request are added to the milestone of the version currently in development.

To download an APK when reviewing a PR:

1. click on Show All Checks,
2. click Details next to "Taskcluster (pull_request)" after it appears and then finishes with a green checkmark,
3. click on the "Fenix - assemble" task, then click "Run Artifacts".
4. the APK links should be on the left side of the screen, named for each CPU architecture

[liuche]

lgtm, and this is only printing something out so.

[codecov-io]

Codecov Report

Merging #6509 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##             master   #6509   +/-   ##
========================================
  Coverage      17.3%   17.3%           
  Complexity      391     391           
========================================
  Files           281     281           
  Lines         11225   11225           
  Branches       1546    1546           
========================================
  Hits           1942    1942           
  Misses         9128    9128           
  Partials        155     155

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