Creational Pattern Pull Request)

Why I did it?
I have used the factory design pattern to do my creational pattern where i had to provide an interface for creating objects in superclass, but allowing subclasses to alter the type of objects that will be created. 
How i did it?
I created a new interface class for location to implement creational pattern and the interface for location class is missing so i just added an interface class and serialized the location into a dict.

app/location/__init__.py

@@ -3,9 +3,18 @@
 from ..utils import countries
 from ..utils.populations import country_population
 
+from abc import abstractmethod, ABCMeta
+
+class ILocation(metaclass=ABCMeta):
+
+    @abstractmethod
+    def serialize():
+        """
+        Serializes the location into a dict.
+        """
 
 # pylint: disable=redefined-builtin,invalid-name
-class Location:  # pylint: disable=too-many-instance-attributes
+class Location(ILocation):  # pylint: disable=too-many-instance-attributes
     """
     A location in the world affected by the coronavirus.
     """
@@ -74,6 +83,7 @@ def serialize(self):
         }
 
 
+
 class TimelinedLocation(Location):
     """
     A location with timelines.