docs: add hyperlinks to main and legacy branches

README.md

@@ -4,8 +4,8 @@ This is a [Singer](https://singer.io) tap that produces JSON-formatted data foll
 
 ## Important notice
 
-- This repository's default branch (`legacy-stable`) is kept for compatibility reasons but is no longer under active development.
-- New development is being performed against the `main` branch, which is based on a port to the Meltano SDK in Pull Request #65.
+- This repository's default branch [`legacy-stable`](https://github.com/MeltanoLabs/tap-gitlab/tree/legacy-stable) is kept for compatibility reasons but is no longer under active development.
+- New development is being performed against the [`main`](https://github.com/MeltanoLabs/tap-gitlab/tree/main) branch, which is based on a port to the Meltano SDK in Pull Request #65.
 - For a stable experience, users of this tap should begin pinning their installations to a specific [release](https://github.com/MeltanoLabs/tap-gitlab/releases) instead of branch references. More instructions are provided within the `README.md` of the `main` branch.
 
 ## About this tap