Made latlng accessible to liquid

lib/location.rb

@@ -104,7 +104,7 @@ class Location
 end
 
 class LocationDrop
-  KEYS = Location.members.map(&:to_s).concat(%w[latitude longitude])
+  KEYS = Location.members.map(&:to_s).concat(%w[latitude longitude latlng])
 
   def before_method(key)
     if KEYS.include?(key)