Adding lat long fields to corelocation.LocationCoordinate2D (#208)

* Adding lat long fields to corelocation.LocationCoordinate2D

* Proper capitalization for export

Author: catilac

macos/corelocation/corelocation_structs.go

@@ -1,3 +1,6 @@
 package corelocation
 
-type LocationCoordinate2D struct{}
+type LocationCoordinate2D struct {
+	Latitude  LocationDegrees
+	Longitude LocationDegrees
+}