Problems with putting PWS (Sainlogic FT0300) in HA

Hi.

I have some issues with putting my Sainlogic FT0300 into HA. I do it exactly as described in https://github.com/cytech/home-assistant-wundergroundpws and when i check my configuration i get this error:

Invalid config for [sensor.wundergroundpws]: [api_key] is an invalid option for [sensor.wundergroundpws]. Check: sensor.wundergroundpws->api_key. (See ?, line ?).

Any idea what could be wrong?