Update changelog.txt

changelog.txt

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 *** Changelog ***
 
-= 2.2.0   - 2024.04.04 =
-* Fix 	   - Compatibility for Shopware 6.6 series
-
-= 2.1.0    - 2024.02.20 =
-* New      - Implemented Direct ACH payment
-* Enhanced - Callback has been optimized as per the new testcase 
-
-= 2.0.0    - 2024.01.18 =
-* Fix      - Compatibility for Shopware version 6.5.0.0
-
 = 1.0.0    - 2023.04.27 =
 New release: Payment App built with improved seamless customer experience and brand configurations in the Novalnet Merchant Admin Portal to make it easier to preview and customise the checkout page