Update webpack.md to clarify what the config does#657

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wyuenho wants to merge 2 commits intoenzymejs:masterfrom wyuenho:patch-1

+22-30

Commits on Nov 4, 2016

Remove cheerio as it's no longer optional depending on React version. I've also added an alternative config using the IgnorePlugin that will achieve the same effect.
wyuenho
committed

Commits on Nov 15, 2016

Merge branch 'master' into patch-1
wyuenho
authored