feat(breaking): upgrade to Jest 25

[greenkeeper]

There have been updates to the jest2 monorepo:

• The dependency pretty-format was updated from 24.9.0 to 25.1.0.
• The dependency jest-snapshot was updated from 24.9.0 to 25.1.0.
• The dependency jest-diff was updated from 24.9.0 to 25.1.0.

These versions are 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.

This monorepo update includes releases of one or more dependencies which all belong to the jest2 group definition.

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Publisher: davidzilburg
License: MIT

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Fixes #112

[pedrottimark]

The breaking change in the snapshot files is to trim spaces in diff columns of empty lines:

Jest 24	Jest 25
'+ '	'+'
'- '	'-'
' '	''

This avoids a possible unexpected hassle. Until I changed the settings in my code editor, it trimmed these spaces and messed up the snapshot criteria when I edited a snapshot file. Unrelated tests suddenly failed, and I had to update them to their original content before I committed the changes.

[thymikee]

Yup, I like that change and it aligns nicely with major bump :)

[pedrottimark]

For the default colors: false option, new options in jest-diff can avoid need for strip-ansi

See https://www.npmjs.com/package/jest-diff#options

Here is pseudo code:

const noColor = val => val;

{
  aColor: noColor,
  bColor: noColor,
  changeColor: noColor,
  changeLineTrailingSpaceColor: noColor,
  commonColor: noColor,
  commonLineTrailingSpaceColor: noColor,
  patchColor: noColor,
}