Added todo relateing to the bugfix issue

ref #65 #68

src/models/entities/Address.ts

@@ -81,6 +81,7 @@ export class Address {
   @OneToMany(() => Participant, participant => participant.address, { nullable: true })
   participants: Participant[];
 
+  //TODO: #68
   // /**
   //  * Used to link the address to runner groups.
   //  */