Update migrate.md

[olvvlo]

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[codecov-io]

Codecov Report

Merging #3098 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3098   +/-   ##
=======================================
  Coverage   65.54%   65.54%           
=======================================
  Files          20       20           
  Lines         859      859           
  Branches       47       47           
=======================================
  Hits          563      563           
  Misses        283      283           
  Partials       13       13

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