doc: Update README.md.

README.md

@@ -8,15 +8,25 @@
     <a href="https://github.com/goreleaser/fileglob/actions?workflow=build"><img alt="GitHub Actions" src="https://img.shields.io/github/workflow/status/goreleaser/fileglob/build?style=for-the-badge"></a>
     <a href="https://codecov.io/gh/goreleaser/fileglob"><img alt="Codecov branch" src="https://img.shields.io/codecov/c/github/goreleaser/fileglob/master.svg?style=for-the-badge"></a>
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-    <a href="http://godoc.org/github.com/goreleaser/fileglob"><img alt="Go Doc" src="https://img.shields.io/badge/godoc-reference-blue.svg?style=for-the-badge"></a>
+    <a href="https://pkg.go.dev/github.com/goreleaser/fileglob"><img alt="Go Doc" src="https://img.shields.io/badge/godoc-reference-blue.svg?style=for-the-badge"></a>
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   </p>
 </p>
 
 ## What
 
 `fileglob` is a glob library that uses [gobwas/glob](https://github.com/gobwas/glob) underneath
-and returns only matching files.
+and returns only matching files or direcories, depending on the configuration. Due to this great foundation, `fileglob` supports:
+
+* Asterisk wildcards (`*`)
+* Super-asterisk wildcards (`**`)
+* Single symbol wildcards (`?`)
+* Character list matchers with negation and ranges (`[abc]`, `[!abc]`, `[a-c]`)
+* Alternative matchers (`{a,b}`)
+* Nested globbing (`{a,[bc]}`)
+* Escapable wildcards (`\{a\}/\*` and `fileglob.QuoteMeta(pattern)`)
+
+By also building on top of [spf13/afero](https://github.com/spf13/afero), a range of alternative filesystems as well as custom filesystems are supported. For example, an in-memory filesystem can be used (`fileglob.Glob("/a/b", fileglob.WithFs(afero.NewMemMapFs()))`):
 
 ## Why