Update CHANGELOG.md

CHANGELOG.md

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 # Change Log
 
-## [5.5.0](https://github.com/plivo/plivo-java/tree/v5.5.0) (2021-11-15)
+## [5.5.0](https://github.com/plivo/plivo-java/tree/v5.5.0) (2021-11-25)
 **Features - Voice: Multiparty calls**
 - The [Add Multiparty Call API](https://www.plivo.com/docs/voice/api/multiparty-call/participants#add-a-participant) allows for greater functionality by accepting options like `start recording audio`, `stop recording audio`, and their HTTP methods.
 - [Multiparty Calls](https://www.plivo.com/docs/voice/api/multiparty-call/) now has new APIs to `stop` and `play` audio.