update changelog

Author: tsolakoua

CHANGELOG.rst

@@ -7,6 +7,9 @@ Add support for the `Transfer Search API <https://developers.amadeus.com/self-se
 Add support for the `Transfer Booking API <https://developers.amadeus.com/self-service/category/cars-and-transfers/api-doc/transfer-booking/api-reference>`_
 
 Add support for the `Transfer Management API <https://developers.amadeus.com/self-service/category/cars-and-transfers/api-doc/transfer-management/api-reference>`_
+
+Big thanks to `Siddhartha Dutta <https://github.com/siddydutta>`_ for his contribution to the above implementations!
+
 8.0.0 - 2023-01-30
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 Decommissioned Travel Restrictions API v1