• Add support for Bot API 2.3.1
• Add support for deleteMessage API method
• New, simpler API for JobQueue - #484
• Download files into file-like objects - #459
• Use vendor urllib3 to address issues with timeouts
  • The default timeout for messages is now 5 seconds. For sending media, the default timeout is now 20 seconds.
• String attributes that are not set are now None by default, instead of empty strings
• Add text_markdown and text_html properties to Message - #507
• Add support for Socks5 proxy - #518
• Add support for filters in CommandHandler - #536
• Add the ability to invert (not) filters - #552
• Add Filters.group and Filters.private
• Compatibility with GAE via urllib3.contrib package - #583
• Add equality rich comparision operators to telegram objects - #604
• Several bugfixes and other improvements
• Remove some deprecated code