Update CHANGES.txt

Updating changelog for 2.4.0

Author: NicoZelaya

CHANGES.txt

@@ -1,3 +1,7 @@
+2.4.0 (Jul 18, 2023)
+  - Updated @splitsoftware/splitio package to version 10.23.0 that includes:
+    - Updated streaming architecture implementation to apply feature flag updates from the notification received which is now enhanced, improving efficiency and reliability of the whole update system.
+
 2.3.2 (May 16, 2023)
   - Updated @splitsoftware/splitio package to version 10.22.5 that includes:
     - Updated terminology on the SDKs codebase to be more aligned with current standard without causing a breaking change. The core change is the term split for feature flag on things like logs and IntelliSense comments.