Update rollup-plugin-json to the latest version 🚀

[greenkeeper]

The devDependency rollup-plugin-json was updated from 3.1.0 to 4.0.0.

This version is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

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[codecov-io]

Codecov Report

Merging #641 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #641   +/-   ##
=======================================
  Coverage   92.63%   92.63%           
=======================================
  Files           7        7           
  Lines        1073     1073           
=======================================
  Hits          994      994           
  Misses         79       79

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[coveralls]

Coverage remained the same at 89.502% when pulling 795a090 on greenkeeper/rollup-plugin-json-4.0.0 into 570c19f on master.