Add an incompatible change entry (refs: #6186)

[tk0miya]

Feature or Bugfix

• Document

Purpose

• refs: [v2.0.0b1] TemplateNotFound #6186

[codecov]

Codecov Report

Merging #6195 into 2.0 will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##             2.0   #6195   +/-   ##
=====================================
  Coverage   83.5%   83.5%           
=====================================
  Files        274     274           
  Lines      39348   39348           
  Branches    5870    5870           
=====================================
  Hits       32856   32856           
  Misses      5140    5140           
  Partials    1352    1352

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