Generating screenshots for stories that don't have them

[fusioneery]

Thanks for the wonderful library.
I have a question for 3.5.2 version: can I force generating screenshots for all stories that don't have them without Storybook Web UI?
It'll be helpful for using in CI, for example.

I have a very little typo correction. I think it's not worth individual PR, so here it is in README.md, jest.setup.js file, line 18:
const page = await browserS[browserType].newPage(options);

[ccpu]

Thank you for the correction. Unfortunatly it's not possible to generate the screenshots without Storybook Web UI, it can be a useful feature, however, I don't think I can implement this feature because of time shortage. Sorry