Update CHANGELOG.md

Author: manjunath-plivo

CHANGELOG.md

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 # Change Log
-## [5.49.0](https://github.com/plivo/plivo-dotnet/tree/v5.49.0) (2024-09-10)
+## [5.49.0](https://github.com/plivo/plivo-dotnet/tree/v5.49.0) (2024-09-30)
 **Feature - Adding new param support for Number Masking session with single party **
 - Added `create_session_with_single_party`, `virtual_number_cooloff_period` and `force_pin_authentication` attributes in Masking Session