chore: bump version to 0.3.0

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: fahchen

mix.exs

@@ -1,7 +1,7 @@
 defmodule DprintMarkdownFormatter.MixProject do
   use Mix.Project
 
-  @version "0.2.0"
+  @version "0.3.0"
   @source_url "https://github.com/fahchen/dprint_markdown_formatter"
 
   def project do