Update the changelog to include details about 2.0.4 (#1781)

* Update the changelog to include details about this version

* add the release date

* Use \ to get a new line

* Use \ to get a new line for better readability

* Use \ to get a new line for better readability

vscode-dotnet-runtime-extension/CHANGELOG.md

@@ -7,8 +7,15 @@ and this project adheres to [Semantic Versioning].
 
 ## [Unreleased]
 
-## [2.0.4]
+## [2.0.4] - 2024-05-03
+Adds the setting `sharedExistingDotnetPath` to use an existing install for all extensions, instead of having to set the setting for every individual extension.
 
+UX improvements for C# DevKit and the Global SDK API.\
+Bug fixes for the recommended version API when the user is offline or on an unsupported distro.
+
+Improved error logging for diagnosing issues that users report.\
+Improved error messages.\
+Updates to dependencies and a simplified dependency chain.
 
 ## [2.0.3] - 2024-03-21