lftp 4.4.0 发布，命令行的FTP工具

lftp 4.4.0 发布，LFTP是一款非常著名的字符界面的文件传输工具。支持FTP、HTTP、FISH、SFTP、HTTPS和FTPS协议。如果还需要ssl的支持，则需要额外的OpenSSL依赖。

改进记录：

• Implements Bittorrent extensions (FAST, DHT, LTEP, ut_metadata, ut_pex).
• Adds support for magnet links.
• A new setting torrent:use-dht.
• A new torrent option --dht-bootstrap for manual bootstrapping.
  
• Adds support for name.utf-8 and path.utf-8 in torrent metadata.
  
• Now net:limit-rate and net:limit-total-rate settings can use suffixes, e.g.
  
• `set net:limit-total-rate 1M:500k'.
  
• Allows numeric user names.
  
• Doesn't try to upload if ALLO fails.
  
• Always sends PROT to FTP servers when AUTH is activated.
  
• Several bugs have been fixed