Fix duplicate errors on the client overlay

[arunoda]

This will fix the issue: storybookjs/storybook#543

We do this by using stats.toJson({ errorDetails: false }) as mentioned by @SpaceK33z.
I tested this with Storybook and the above issue is gone with this fix.

[coveralls]

Coverage remained the same at 76.51% when pulling 14d1ffc on arunoda:patch-1 into 04f953d on glenjamin:master.

[glenjamin]

How odd, I've never seen this myself. The extra detail must be in a newer Babel version I guess.

Cool to see that storybook is using hot-middleware too.

Will cut a new release in the morning.

[arunoda]

We were using hot-middleware from the beginning.
Looking forward for the release.

[glenjamin]

Released as v2.13.2.

Hopefully there was nothing else useful in the errorDetails 😅

[SpaceK33z]

Nice. In my manual tests it didn't seem like there is anything useful in errorDetails. At least babel-loader, css-loader, sass-loader don't include useful info it.

I'm also going to release the same fix for webpack-dev-server soon. Would appreciate it if you would notify me if it turns out to include useful info 😈 .