Upgrade to Next.js 6

[timneutkens]

Based on https://twitter.com/probablyup/status/1003857781894631424.

It was actually pretty easy, you weren't using next/babel, meaning Next.js's default preset wasn't used. The other issue was that preval doesn't support Babel 7 yet, but this was fixable by using DefinePlugin.

[timneutkens]

Also add .next to the gitignore, since it doesn't have to be committed.

[timneutkens]

And moved pages/App.js and pages/Home.js, because they're not pages they shouldn't be inside the pages directory. If you keep them in pages they'll be generated as page bundles inside .next and will mess with the common modules calculation.

[codecov[bot]]

Codecov Report

Merging #6 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #6   +/-   ##
=======================================
  Coverage   87.12%   87.12%           
=======================================
  Files           3        3           
  Lines         101      101           
  Branches       27       27           
=======================================
  Hits           88       88           
  Misses          9        9           
  Partials        4        4

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[quantizor]

@timneutkens If you're using Node 10 locally, I think Yarn locally needs to be >= 1.7.0 to be compatible.

[quantizor]

Thanks Tim!

[timneutkens]

🙌