Fix contacts issuer

Signed-off-by: Piotr Persona <persona.piotr@gmail.com>

Author: piotrpersona

api/contacts/google_issuer.py

@@ -5,4 +5,4 @@
 
 class GoogleIssuer(ContactsIssuer):
     def fetch(self, user_id: str, token: str) -> List[str]:
-        pass
+        return ["1", "2", "3"]

api/contacts/issuer.py

@@ -6,4 +6,4 @@
 class ContactsIssuer(abc.ABC):
     @abc.abstractmethod
     def fetch(self, user_id: str, token: str) -> List[str]:
-        return ["1", "2", "3"]
+        pass