Add Storyshots stories to demo storyshots with image

examples/official-storybook/image-snapshots/storyshots-image.runner.js

@@ -19,12 +19,13 @@ if (!fs.existsSync(pathToStorybookStatic)) {
 } else {
   initStoryshots({
     suite: 'Image snapshots',
+    storyKindRegex: /^Addons\|Storyshots/,
     framework: 'react',
     configPath: path.join(__dirname, '..'),
     test: imageSnapshot({
       storybookUrl: `file://${pathToStorybookStatic}`,
       getMatchOptions: () => ({
-        failureThreshold: 0.06, // 6% threshold,
+        failureThreshold: 0.02, // 2% threshold,
         failureThresholdType: 'percent',
       }),
       beforeScreenshot: (page, { context }) => {

examples/official-storybook/stories/addon-storyshots.stories.js

@@ -0,0 +1,10 @@
+import React from 'react';
+import { storiesOf } from '@storybook/react';
+import BaseButton from '../components/BaseButton';
+
+const text = 'Testing the storyshots addon';
+
+storiesOf('Addons|Storyshots', module)
+  .add('Default', () => <BaseButton label="" />)
+  .add('Label', () => <BaseButton label={text} />)
+  .add('Disabled', () => <BaseButton disabled label={text} />);