docs: redirect to the npm docs for latest release (#541)

* docs: redirect to the npm docs for latest release

* Apply suggestions from code review

Co-Authored-By: Jacob Heun <jacobheun@gmail.com>

Co-authored-by: Jacob Heun <jacobheun@gmail.com>

README.md

@@ -30,6 +30,9 @@
 
 We've come a long way, but this project is still in Alpha, lots of development is happening, API might change, beware of the Dragons 🐉..
 
+The documentation in the master branch may contain changes from a pre-release.
+If you are looking for the documentation of the latest release, you can view the latest release on [**npm**](https://www.npmjs.com/package/libp2p), or select the tag in github that matches the version you are looking for.
+
 **Want to get started?** Check our [examples folder](/examples).
 
 [**`Weekly Core Dev Calls`**](https://github.com/ipfs/pm/issues/650)