Add history fragment

Signed-off-by: Jakub Jelen <jjelen@redhat.com>

Author: Jakuje

docs/changelog-fragments/638.bugfix.rst

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+Fixed reading files over SFTP that go over the pre-defined chunk size.
+
+Prior to this change, the files could end up being corrupted, ending up with the last read chunk written to the file instead of the entire payload.
+
+-- by :user:`Jakuje`