supporting file [ne_10m_coastline/ne_10m_coastline.shp] missing from examples

[polycopter]

in earth.go:

func LoadPaths() ln.Paths {
var result ln.Paths
file, err := shp.Open("examples/ne_10m_coastline/ne_10m_coastline.shp")

[msurguy]

@polycopter I believe it's here: https://github.com/nvkelso/natural-earth-vector/blob/master/10m_physical/ne_10m_coastline.shp