fix(core): update

ts/interfaces/service.ts

@@ -1,10 +1,11 @@
 import * as interfaces from './';
 import { DockerNetwork } from '../docker.classes.network';
 import { DockerSecret } from '../docker.classes.secret';
+import { DockerImage } from '../docker.classes.image';
 
 export interface IServiceCreationDescriptor {
   name: string;
-  image: string;
+  image: DockerImage;
   labels: interfaces.TLabels;
   networks: DockerNetwork[];
   networkAlias: string;