Allow alternative timezone format seen in Xioawa E25

[rytilahti]

Fixes #759

[coveralls]

Coverage decreased (-0.1%) to 73.831% when pulling 35f9736 on fix/xiaowa_timezone into c9f238c on master.

[lpfann]

I tried the PR and noticed that the dictionary is also encapsulated in a list.
The following code works for me now:

  @command()
    def timezone(self):
        """Get the timezone."""
        res_list = self.send("get_timezone")
        res = res_list[0]

        if isinstance(res, dict):
            # Xiaowa E25 example
            # {'olson': 'Europe/Berlin', 'posix': 'CET-1CEST,M3.5.0,M10.5.0/3'}
            if "olson" not in res:
                raise VacuumException("Unsupported timezone format: %s" % res)

            return res["olson"]

        # Gen1 vacuum: ['Europe/Berlin']
        return res

[rytilahti]

Thanks for testing, I pushed an update!

[lpfann]

Thanks, works now!
Hopefully this fixes the regression in HASS.

[rytilahti]

Thanks again for testing, it will be fixed then whenever new python-miio gets released and homeassistant gets a version bump!