binary_sensor.workday doesn't support US states

[drkp]

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Home Assistant release (hass --version):

0.42.0

Python release (python3 --version):
3.5.3

Component/platform:

binary_sensor.workday

Description of problem:

workday provides country and province config options that get passed to the holidays python module. Apparently holidays does not take province and state as interchangeable, so the province option will not work for US states. Specifying a state code as province causes it to fail at startup.

Expected:

Problem-relevant configuration.yaml entries and steps to reproduce:

binary_sensor:
  - platform: workday
    country: US
    province: WA

ERROR:homeassistant.components.binary_sensor.workday:There is no province/state WA in country US

Traceback (if applicable):

Additional info: