Add script notification

[crazy-max]

Closes #64
Closes #142

[codecov]

Codecov Report

Merging #147 (d315593) into master (49bb8f1) will decrease coverage by 0.60%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #147      +/-   ##
==========================================
- Coverage   63.46%   62.85%   -0.61%     
==========================================
  Files          10       11       +1     
  Lines         104      105       +1     
==========================================
  Hits           66       66              
- Misses         27       28       +1     
  Partials       11       11              

Impacted Files	Coverage Δ
internal/config/notif.go	0.00% <ø> (ø)
internal/config/notif_script.go	0.00% <0.00%> (ø)

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