docs: add link to formatter.nvim repository (#1)

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Author: matiyas

README.md

@@ -16,7 +16,7 @@ This plugin extracts each section, formats it with the appropriate tool, and rea
 - Configurable formatters for each section via JSON config
 - Automatic SCSS detection from `lang="scss"` attribute
 - Provides `:VueSfcFormat` command
-- Integrates with formatter.nvim
+- Integrates with [formatter.nvim](https://github.com/mhartington/formatter.nvim)
 
 ## Requirements