Move @storybook/addons to peerDependencies

[matteocng]

Moves @storybook/addons to peerDependencies and alerts the user in the README, should help with Accessing nonexistent addons channel errors if the user also installs it as a dependency in the main app.

This modification has been applied to all official storybook addons: storybookjs/storybook#2335 and released in versions: 3.3.0-alpha*

Also see #13.

[floriangosse]

Thank you. I luckily hadn't the problem.

Could you please change the link to the storybook documentation to the rendered version: https://storybook.js.org/basics/faq/#why-is-there-no-addons-channel. That would be nice. :)

And I see that this could solve the problem with react-native? That is really nice. Do you know what is needed to have support for react-native?

[matteocng]

I've changed the link. :)

This PR should eliminate the Accessing nonexistent addons channel issue connected to duplicate instances of the addons module in both Storybook React and Native - obviously all storybook addons distributed in the wild will have to make the switch for this fix to be really effective - but I haven't had the chance to thoroughly test this module with React Native storybook to see if it works.

A super quick test with storybook on Android resulted in Could not find required intl object. <IntlProvider> needs to exist in the component ancestry when applying the decorator, no red screens otherwise (so maybe it's just an intl issue, not specific to this module).

[floriangosse]

Okay. For that we have to check if react-intl has to be used differently in react-native.

Thanks for solving the problem. :-)