Fix modify plugin

[kirillov6]

Fixes #561

[codecov]

Codecov Report

Attention: 58 lines in your changes are missing coverage. Please review.

Comparison is base (7d1a963) 69.67% compared to head (b992453) 70.03%.
Report is 3 commits behind head on master.

❗ Current head b992453 differs from pull request most recent head 16108e2. Consider uploading reports for the commit 16108e2 to get more accurate results

Files	Patch %	Lines
cfg/substitution/substitution.go	87.86%	22 Missing and 11 partials ⚠️
cfg/config.go	82.85%	8 Missing and 4 partials ⚠️
pipeline/config.go	40.00%	4 Missing and 2 partials ⚠️
test/test.go	40.00%	2 Missing and 1 partial ⚠️
fd/file.d.go	50.00%	2 Missing ⚠️
plugin/action/modify/modify.go	91.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #562      +/-   ##
==========================================
+ Coverage   69.67%   70.03%   +0.35%     
==========================================
  Files         109      111       +2     
  Lines       11414    11690     +276     
==========================================
+ Hits         7953     8187     +234     
- Misses       2976     3004      +28     
- Partials      485      499      +14     

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[HeadHunter483]

LGTM!