Update

vendor/github.com/tailscale/hujson/README.md

@@ -1,5 +1,7 @@
 # HuJSON - "Human JSON" ([JWCC](https://nigeltao.github.io/blog/2021/json-with-commas-comments.html))
 
+[![Go Reference](https://pkg.go.dev/badge/github.com/tailscale/hujson.svg)](https://pkg.go.dev/github.com/tailscale/hujson)
+
 The `github.com/tailscale/hujson` package implements
 the [JWCC](https://nigeltao.github.io/blog/2021/json-with-commas-comments.html) extension
 of [standard JSON](https://datatracker.ietf.org/doc/html/rfc8259).
@@ -15,6 +17,14 @@ For details, see the JWCC docs at:
 
 https://nigeltao.github.io/blog/2021/json-with-commas-comments.html
 
+## Formatting with hujsonfmt
+
+`hujsonfmt` is a program that formats HuJSON files. Install it by running:
+
+```
+go install github.com/tailscale/hujson/cmd/hujsonfmt@latest
+```
+
 ## Visual Studio Code association
 
 Visual Studio Code supports a similar `jsonc` (JSON with comments) format. To