Leaflet update to 1.8.0

Hi @dgamoni,

There is a known issue with leaflet 1.7.1 on Safari : https://github.com/Leaflet/Leaflet/issues/7255#issuecomment-720375938

It seems that updating to 1.8.0 fixes this issue :
https://github.com/springmeyer/arc.js/pull/47

Do you think it will be possible to update soon ?

Best regards,