Update CHANGELOG.rst

Author: torresc24

CHANGELOG.rst

@@ -1,12 +1,15 @@
 Changelog
 =========
+5.1.1 - 2021-05-12
+--------------------
+Remove travis ci release support and creating github action
+
 5.1.0 - 2021-05-12
 --------------------
 Add support for the `Flight Availabilities Search API <https://developers.amadeus.com/self-service/category/air/api-doc/flight-availabilities-search/api-reference>`_
 
 Add support for the `Branded Fares Upsell API <https://developers.amadeus.com/self-service/category/air/api-doc/branded-fares-upsell/api-reference>`_
 
-
 5.0.0 - 2021-02-02
 --------------------
 Remove support for Python 2. The SDK requires Python 3.4+