Add Mijia Air Purifier F1 (dmaker.airpurifier.f20) support

[NathanDai]

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Device information:

• Name(s) of the device: Mijia Air Purifier F1
• Link: https://xiaomi-mi.com/air-and-water-purifiers/mijia-air-purifier-f1/

Use miiocli device --ip <ip address> --token <token>.

Model: dmaker.airpurifier.f20
Hardware version: esp8266
Firmware version: 2.1.3

Additional context
If you know already about potential commands or any other useful information to add support for the device, please add that information here.

➜  ~ miiocli airpurifiermiot --ip 192.168.2.30 --token 07f04f911466ftoken9082286ed55bcc8 status
ValueError: None is not a valid OperationMode

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/nathan/.local/bin/miiocli", line 8, in <module>
    sys.exit(create_cli())
  File "/home/nathan/.local/lib/python3.8/site-packages/miio/cli.py", line 45, in create_cli
    return cli(auto_envvar_prefix="MIIO")
  File "/home/nathan/.local/lib/python3.8/site-packages/miio/click_common.py", line 59, in __call__
    return self.main(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/click/core.py", line 717, in main
    rv = self.invoke(ctx)
  File "/usr/lib/python3/dist-packages/click/core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/lib/python3/dist-packages/click/core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/lib/python3/dist-packages/click/core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/lib/python3/dist-packages/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/home/nathan/.local/lib/python3.8/site-packages/miio/click_common.py", line 285, in wrap
    result_msg = result_msg_fmt.format(**kwargs)
  File "/home/nathan/.local/lib/python3.8/site-packages/miio/airpurifier_miot.py", line 117, in mode
    return OperationMode(self.data["mode"])
  File "/usr/lib/python3.8/enum.py", line 309, in __call__
    return cls.__new__(cls, value)
  File "/usr/lib/python3.8/enum.py", line 600, in __new__
    raise exc
  File "/usr/lib/python3.8/enum.py", line 584, in __new__
    result = cls._missing_(value)
  File "/usr/lib/python3.8/enum.py", line 613, in _missing_
    raise ValueError("%r is not a valid %s" % (value, cls.__name__))
ValueError: None is not a valid OperationMode
➜  ~  miiocli airpurifiermb4 --ip 192.168.2.30 --token 07f04f911466ftoken9082286ed55bcc8 status
ValueError: 4 is not a valid OperationMode

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/nathan/.local/bin/miiocli", line 8, in <module>
    sys.exit(create_cli())
  File "/home/nathan/.local/lib/python3.8/site-packages/miio/cli.py", line 45, in create_cli
    return cli(auto_envvar_prefix="MIIO")
  File "/home/nathan/.local/lib/python3.8/site-packages/miio/click_common.py", line 59, in __call__
    return self.main(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/click/core.py", line 717, in main
    rv = self.invoke(ctx)
  File "/usr/lib/python3/dist-packages/click/core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/lib/python3/dist-packages/click/core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/lib/python3/dist-packages/click/core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/lib/python3/dist-packages/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/home/nathan/.local/lib/python3.8/site-packages/miio/click_common.py", line 285, in wrap
    result_msg = result_msg_fmt.format(**kwargs)
  File "/home/nathan/.local/lib/python3.8/site-packages/miio/airpurifier_miot.py", line 117, in mode
    return OperationMode(self.data["mode"])
  File "/usr/lib/python3.8/enum.py", line 309, in __call__
    return cls.__new__(cls, value)
  File "/usr/lib/python3.8/enum.py", line 600, in __new__
    raise exc
  File "/usr/lib/python3.8/enum.py", line 584, in __new__
    result = cls._missing_(value)
  File "/usr/lib/python3.8/enum.py", line 613, in _missing_
    raise ValueError("%r is not a valid %s" % (value, cls.__name__))
ValueError: 4 is not a valid OperationMode
➜  ~ miiocli airpurifier --ip 192.168.2.30 --token 07f04f911466ftoken9082286ed55bcc8 status
Error: {'code': -9999, 'message': 'user ack timeout'}