Add KL125 definition

[mdarnol]

Recently purchased some KL125s and noticed that they caused home assistant to crash because they were not defined and there was no default color temp

Product Link
https://www.kasasmart.com/us/products/smart-lighting/kasa-smart-light-bulb-multicolor-kl125

It says there that the color temp is 2500K-6500K (adjustable via app and cloud)

Reason for the PR

2021-02-23 00:21:44 ERROR (MainThread) [homeassistant.components.light] tplink: Error on device update!
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/helpers/entity_platform.py", line 358, in _async_add_entity
    await entity.async_device_update(warning=False)
  File "/usr/src/homeassistant/homeassistant/helpers/entity.py", line 466, in async_device_update
    await task
  File "/usr/src/homeassistant/homeassistant/components/tplink/light.py", line 468, in async_update
    is_ready = await self.hass.async_add_executor_job(
  File "/usr/local/lib/python3.8/concurrent/futures/thread.py", line 57, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/usr/src/homeassistant/homeassistant/components/tplink/light.py", line 248, in attempt_update
    self._light_features = self._get_light_features()
  File "/usr/src/homeassistant/homeassistant/components/tplink/light.py", line 289, in _get_light_features
    min_mireds = kelvin_to_mired(min_range)
  File "/usr/src/homeassistant/homeassistant/util/color.py", line 515, in color_temperature_kelvin_to_mired
    return math.floor(1000000 / kelvin_temperature)
ZeroDivisionError: division by zero

[coveralls]

Coverage remained the same at 80.357% when pulling 0a3215b on mdarnol:add-kl125-bulb into e03c192 on GadgetReactor:master.

[rytilahti]

This library here is not maintained anymore even when it's still used by homeassistant. Could you please create a patch to https://github.com/python-kasa/python-kasa ? That library will replace pyhs100 when it gets to releasable state.

[mdarnol]

Just to create the loop, new PR is here: python-kasa/python-kasa#143