Fixed release notes, previously used a deprecated file. (#1904)

* Fixed release notes, previously used a deprecated file.

The file linked in the 'Changelist' had been deprecated, moved to https://github.com/microsoft/ApplicationInsights-JS/releases , an active and dynamically supported list of releases.

* Update README.md

Co-authored-by: Nev <54870357+MSNev@users.noreply.github.com>

README.md

@@ -662,7 +662,8 @@ It is expected that most users will be using the `Public` URL, however, it is al
 
 ## Release Notes
 
-[Changelist](./CHANGELIST.md)
+- [Releases](https://github.com/microsoft/ApplicationInsights-JS/releases)
+- [Changelist Notes](./RELEASES.md)
 
 ## Browser Support