fix: add 'handlers' to allowed prevlines for CheckTaskSeparation

[xoxys]

Fixes: #248

[codecov-commenter]

Codecov Report

Merging #249 (201f917) into main (7278e11) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #249   +/-   ##
=======================================
  Coverage   18.03%   18.03%           
=======================================
  Files           9        9           
  Lines        1081     1081           
=======================================
  Hits          195      195           
  Misses        886      886           

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