- Use ``urllib3.PoolManager`` for connection re-use - Rewrite ``run_async`` decorator to re-use threads - New requirements: ``urllib3`` and ``certifi``
**2016-06-10**
4.2.1
- Fix ``CallbackQuery.to_dict()`` bug (thanks to jlmadurga) - Fix ``editMessageText`` exception when receiving a ``CallbackQuery``
**2016-05-28**
4.2
- Implement Bot API 2.1 - Move ``botan`` module to ``telegram.contrib`` - New exception type: ``BadRequest``
**2016-05-22**
4.1.2
- Fix ``MessageEntity`` decoding with Bot API 2.1 changes