Update RELEASE-NOTES.txt

Author: irfano

RELEASE-NOTES.txt

@@ -8,6 +8,7 @@
 - [*] Improved the Filters button colors on the Orders and Products screens [https://github.com/woocommerce/woocommerce-android/pull/14832]
 - [*] Fixed an issue when images for the card reader flows were not shown on tablets [https://github.com/woocommerce/woocommerce-android/pull/14849]
 - [*] Fixed an issue where the count of the filters applied to the orders was not updated correctly [https://github.com/woocommerce/woocommerce-android/pull/14844]
+- [*] Improved the Filters and Add button colors [https://github.com/woocommerce/woocommerce-android/pull/14872]
 
 23.5
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