Support LngLat object in Marker coordinates

[iBobik]

Current coordinates props supports only array, but LngLat works also, but is not allowed by the type check:

[Vue warn]: Invalid prop: type check failed for prop "coordinates". Expected Array, got Object found in ---> <MapMarker>

[richardfeliciano]

Yep, i`m trying to center markers, and always get this warn, is annoying,

[danimalweb]

I also have this issue.