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* Support Python 3.7
* Fix to task cancellations and CRC errors for async serial clients.
* Fix passing serial settings to asynchronous serial server.
* Fix `AttributeError` when setting `interCharTimeout` for serial clients.
* Provide an option to disable inter char timeouts with Modbus RTU.
* Add support to register custom requests in clients and server instances.
* Fix read timeout calculation in ModbusTCP.
* Fix SQLDbcontext always returning InvalidAddress error.
* Fix SQLDbcontext update failure
* Fix Binary payload example for endianess.
* Fix BinaryPayloadDecoder.to_coils and BinaryPayloadBuilder.fromCoils methods.
* Fix tornado async serial client `TypeError` while processing incoming packet.
* Fix erroneous CRC handling in Modbus RTU framer.
* Support broadcasting in Modbus Client and Servers (sync).
* Fix asyncio examples.
* Improved logging in Modbus Server .
* ReportSlaveIdRequest would fetch information from Device identity instead of hardcoded `Pymodbus`.
* Fix regression introduced in 2.2.0rc2 (Modbus sync client transaction failing)
* Minor update in factory.py, now server logs prints received request instead of only function code