changelog updated

Author: eshangupta-plivo

CHANGELOG.md

@@ -1,6 +1,6 @@
 # Change Log
 
-## [5.51.1](https://github.com/plivo/plivo-ruby/tree/v4.62.1) (2025-08-06)
+## [5.51.1](https://github.com/plivo/plivo-dotnet/tree/v5.51.1) (2025-08-06)
 **Feature - Expanded Media Type Support for Media Upload**
 - Added support for additional media file formats: GIF, MP3, WAV, OGG, 3GPP, 3GPP2, VCARD, CSV, XLS, XLSX, and PLAIN text files
 ## [5.51.0](https://github.com/plivo/plivo-dotnet/tree/v5.51.0) (2025-04-30)