update changelog

CHANGELOG.txt

@@ -8,6 +8,7 @@
 - The directory generation for file extraction has been changed to use unique directory names created with high-resolution timestamps. Additionally, a retry limit for directory creation has been introduced, reducing the risk of infinite loops due to name collisions.
 - Implemented variable-length buffer handling for path strings in stub, eliminating the risk of buffer overruns dependent on MAX_PATH.
 - In order to reduce security risks during the cleanup process before application termination, we have implemented a safe current directory change from the system directory and the root of the C drive to the user's temporary directory and the directory of the app executable.
+- The 'stub' executable has been enhanced for security, ensuring it prevents directory traversal attacks by verifying that path elements do not contain relative notations like '.' or '..'.
 
 === 1.3.15
 - Support for Ruby 2.6 and above.