Make it clear that you need to add the ChangeRepository to the entity's module and service

[joshwingreene]

At the moment, it isn't clear that you need to add the ChangeRepository to the entity's module and service.

Here's an example that you could include:

agent.module.ts

@Module({
  imports: [
    TypeOrmModule.forFeature([
      AddressRepository,
      AgentRepository,
      ChangeRepository, // <---
    ])
  ],
  controllers: [AgentController],
  providers: [AgentService]
})
export class AgentModule {}

agent.service.ts

@Injectable()
export class AgentService {
  constructor(
    @InjectRepository(AddressRepository)
    private addressRepository: AddressRepository,
    @InjectRepository(AgentRepository)
    private agentRepository: AgentRepository,
    @InjectRepository(ChangeRepository)
    private changeRepository: ChangeRepository,  // <--
  ) {}