Do not allow dashes in file names

[alexandear]

This PR renames decompression-bomb.go to decompression_bomb.go and directory-traversal.go to directory_traversal.go for consistency. Also, enables revive.filename-format to forbid - in filenames.

❯ golangci-lint run
rules/decompression-bomb.go:15:9: filename-format: Filename decompression-bomb.go is not of the format ^[a-z][_a-z0-9]*.go$. (revive)
package rules
        ^
rules/directory-traversal.go:1:9: filename-format: Filename directory-traversal.go is not of the format ^[a-z][_a-z0-9]*.go$. (revive)
package rules
        ^
2 issues:
* revive: 2

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.15%. Comparing base (1216c9b) to head (5e0cc22).
Report is 80 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1359      +/-   ##
==========================================
- Coverage   68.49%   63.15%   -5.35%     
==========================================
  Files          75       74       -1     
  Lines        4384     5179     +795     
==========================================
+ Hits         3003     3271     +268     
- Misses       1233     1780     +547     
+ Partials      148      128      -20     

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