fixed dependencies

vendor/github.com/paulmach/orb/planar/length.go

@@ -0,0 +1,12 @@
+package planar
+
+import (
+	"github.com/paulmach/orb"
+	"github.com/paulmach/orb/internal/length"
+)
+
+// Length returns the length of the boundary of the geometry
+// using 2d euclidean geometry.
+func Length(g orb.Geometry) float64 {
+	return length.Length(g, Distance)
+}