SFTP module: code update for paramiko/transport.py

[AlexBtrZ]

Hello,
need code update for file paramiko/transport.py

-    return self._cipher_info[name]['class'].new(key, self._cipher_info[name]['mode'], iv, counter)
+    return self._cipher_info[name]['class'].new(key, self._cipher_info[name]['mode'], '', counter)

paramiko/paramiko#889
https://github.com/paramiko/paramiko/pull/889/files
This helps solve the problem of uploading screenshots to SFTP : "Failed to call SFTPUploader.upload()"
Thanks.

[leo-mao]

Good job bro