v0.5.4

Changelog

3c6c7d3 Merge pull request #8 from goreleaser/fix-subfolders
24b75ec chore: go test -race
9b70ad6 test: deb: added more tests
20c7fa9 style: deb: organized code
a7efc01 typo: deb
1ae64d6 fix: deb: do not create multiple entries for the same folder
4ece050 fix: deb: folder modtime
d1e56a3 fix: deb: create subfolders and use GNU tar format

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