API changes:
- 119: in `send_msg_with_attachment` and `send_msg_with_attachment_async`, `path_to_attachment` parameter has been renamed to `attachment`
Bug fixes:
- 152 / PLAT-10646: Unknown event breaks DF loop
- 140: Upgraded aiohttp to 3.7.4
Documentation:
- 119: Document message attachment supported parameters
Installation:
`$ pip install sym-api-client-python==1.3.4`