Added .pl to the list of supported files

[cboneti]

Includes support for Perl (.pl) file, treated in the same way as shell scripts.

[codecov-commenter]

Codecov Report

Merging #98 (2950e83) into master (d1984d0) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #98   +/-   ##
=======================================
  Coverage   47.56%   47.56%           
=======================================
  Files           2        2           
  Lines         246      246           
=======================================
  Hits          117      117           
  Misses        122      122           
  Partials        7        7           

Impacted Files	Coverage Δ
main.go	40.19% <100.00%> (ø)

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[willnorris]

Thanks!