9.1.0: String representations

• Made FtpEntry, FtpEntryList, FtpTransfer and FtpTransferStream
  implement lang.Value, restoring their custom string representations.
  (@thekid)
• Added compatibility with PHP 7.3 - @thekid

9.0.1: Logging compatiblity

• Made compatible with xp-framework/logging version 9.0.0 - @thekid

9.0.0: Passive mode

• Dropped dependency on xp-framework/security - @thekid
• Merged PR #3: Default passive mode to true - @thekid

8.0.0: XP9 Compatibiliy

• Added forward compatibility with XP 9.0.0 - @thekid
• Heads up: Dropped PHP 5.5 support. Minimum PHP version is now PHP 5.6.0
  (@thekid)

7.2.0: Connection accessors

• Added isConnected() method to FtpConnection class in order to detect
  and gracefully handle disconnects.
• Added timeout(), passive(), user and remoteEndpoint accessors
  to FtpConnection class
  (@thekid)

7.1.0: XP8 compatibility

• Added forward compatibility with XP 8.0.0 - @thekid

7.0.1: Directory listing fix

• Merged PR #2: Fix problem with listing empty directories - @thekid

7.0.0: XP7 compatibility

• Adopted semantic versioning. See xp-framework/rfc#300 - @thekid
• Added version compatibility with XP 7 - @thekid

6.2.2: XP7 Forward compatibility

• Fix code to use nameof() instead of the deprecated getClassName()
  method from lang.Generic. See xp-framework/core#120
  (@thekid)

6.2.1: Remove ensure

• Rewrote code to avoid deprecated ensure statement - @thekid