Wind speed always displayed as 'mph' even when using metric

[aspersieman]

If the selected prop value for 'units' is 'uk', according to the openweathermap.org docs (https://openweathermap.org/current#data) the correct wind speed units should be metric and in meters/second. However the widget is hard-coded to always show 'mph'.

Would you accept a PR to address this?

[dipu-bd]

Yes, Please send a PR