v0.4.0

Changelog

• 1ee1e16 Add argument to filter patterns to group
• 3064f20 Add basic Goreleaser configuration
• 2b89733 Add go.mod
• 1a25d1a Add mkdocs documentation
• 666a01a Check for nil regular expression
• 3d2d66e Merge pull request #5 from zikani03/use-goreleaser
• 8072a88 Merge pull request #6 from zikani03/filter-by-pattern
• 6ad79aa Only print if -verbose specified
• 43efea5 Remove os.Exit in tree, display err returned from Build()
• 368b414 Rename constants to make them more idiomatic Go
• e280a9f Rename version flag
• fa7e830 Update README
• dd21222 Update goreleaser config