Use correct PR number in readme

Author: dibarbet

README.md

@@ -32,7 +32,7 @@ If you still need Unity or .NET Framework support, you can set `omnisharp.useMod
 See issue [#5120](https://github.com/OmniSharp/omnisharp-vscode/issues/5120) for more details.
 
 ## What's new in 1.25.5
-* Update OmniSharp to 1.39.5 (PR: [#5617](https://github.com/OmniSharp/omnisharp-vscode/pull/5617))
+* Update OmniSharp to 1.39.5 (PR: [#5618](https://github.com/OmniSharp/omnisharp-vscode/pull/5618))
   * Update to Roslyn `4.6.0-3.23153.5` (PR:[#2511](https://github.com/OmniSharp/omnisharp-roslyn/pull/2511))
   * Report to the client if the project being loaded is sdk style (PR:[#2502](https://github.com/OmniSharp/omnisharp-roslyn/pull/2502))
 * Automatically trust ASP.NET Core HTTPS development certificate (PR: [#5589](https://github.com/OmniSharp/omnisharp-vscode/pull/5589))