update changelog

Signed-off-by: Mateusz Szczygieł <[email protected]>

changelog.md

@@ -3,6 +3,7 @@
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 * Remove support for deprecated, unsecure protocols V1, V2, V4 and V5
 * Sanitize file ID before downloading a file, to prevent the temporary file from being allowed to traverse parent dirs
+* Implement automatic transfer cancellation when all files reach the terminal state
 
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