fix build and useless done and async generator

.circleci/config.yml

@@ -359,7 +359,7 @@ jobs:
       - run:
           name: Test
           command: |
-            yarn test
+            yarn test -w 8
 
       - run:
           name: Codecov

__tests__/Storyshots.test.js

@@ -22,18 +22,13 @@ global.Date.now = jest.fn(() => new Date('2019-10-10').getTime());
 
 const converter = new Stories2SnapsConverter();
 
-// Runner
 initStoryshots({
-	asyncJest: true,
-	test: ({ story, context, done }) => {
+	test: ({ story, context }) => {
 		const snapshotFilename = converter.getSnapshotFileName(context);
 		const storyElement = story.render();
 		const { update, toJSON } = render(storyElement);
 		update(storyElement);
-		setTimeout(() => {
 		const json = toJSON();
 		expect(JSON.stringify(json)).toMatchSpecificSnapshot(snapshotFilename);
-			done();
-		}, 10);
 	}
 });