Update README

Author: gbro3n

README.md

@@ -12,7 +12,7 @@ Website: [asnotes.io](https://www.asnotes.io) | Developer: [App Software Ltd](ht
 |||
 |--|--|
 |Install | [Visual Studio Marketplace](https://marketplace.visualstudio.com/items?itemName=appsoftwareltd.as-notes) / [Open VSX](https://open-vsx.org/extension/appsoftwareltd/as-notes)|
-|Pro Features | [asnotes.io/pricing](https://www.asnotes.io)|
+|Pro Features | [asnotes.io/pricing](https://www.asnotes.io?attr=src_readme)|
 |Docs | [docs.asnotes.io](https://docs.asnotes.io)|
 |Blog | [blog.asnotes.io](https://blog.asnotes.io)|