Fix type issue in allItems (#12)

lib/paris.ts

@@ -399,7 +399,7 @@ export class Paris<TConfigData = any> {
 	 * @param {DataEntityType<TEntity extends EntityModelBase>} entityConstructor
 	 * @returns {Observable<Array<TEntity extends EntityModelBase>>}
 	 */
-	allItems<TEntity extends EntityModelBase>(entityConstructor:DataEntityType<TEntity>):Observable<Array<TEntity>>{
+	allItems<TEntity extends EntityModelBase<TId>, TId extends EntityId>(entityConstructor:DataEntityType<TEntity, any, TId>):Observable<Array<TEntity>>{
 		const repository:Repository<TEntity> = this.getRepository(entityConstructor);
 		if (repository)
 			return repository.allItems$;

test/modeling/modeler.spec.ts

@@ -299,7 +299,7 @@ describe('Modeler', () => {
 		});
 
 		it("calls the entity's `serializeItem` method with the proper params", () => {
-			const newSerializedItem = new serializedEntity({ id: undefined, name: 'test' });
+			const newSerializedItem = new serializedEntity({ id: undefined, name: 'test', someArray: null });
 			const serializationData = { test: 1 };
 
 			serializedItemRepo.save(newSerializedItem, null, serializationData);