Issue 1295. Added revert action for migration

[yurasavin]

Fixes # Added reverse action for migration 0006

Description of the Change

Without reverse action it's impossible to revert applied migration

Checklist

• [x] PR only contains one change (considered splitting up PR)
• [ ] unit-test added
• [ ] documentation updated
• [x] CHANGELOG.md updated (only for user relevant changes)
• [x] author name in AUTHORS

[codecov[bot]]

Codecov Report

Merging #1296 (be8e7cc) into master (e4b06eb) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1296   +/-   ##
=======================================
  Coverage   97.34%   97.34%           
=======================================
  Files          32       32           
  Lines        2073     2073           
=======================================
  Hits         2018     2018           
  Misses         55       55           

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