Add yarn support to readme

readme.md

@@ -8,6 +8,7 @@
 - Discovers and processes all `package.json` files in repository (supports monorepo architecture)
 - Supports multiple major versions per-dependency at once
 - Configurable via file, environment, CLI, and `package.json`
+- Supports `yarn.lock` files
 - Self-hosted
 
 ## Install