Update pixelmatch in group baseliners to the latest version 🚀

The dependency pixelmatch was updated from `4.0.2` to `5.0.0`.

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.

Release Notes for v5.0.0

⚠️ Breaking: update to ES6 syntax, dropping Node <6.4 and IE11 support.
🎨 Added configurable diff output (options alpha, aaColor, diffColor) (@dreignier @VP-)
⚡️ Improve matching performance by ~35%.
⚡️ Bypass detailed comparison when image data is identical, significantly improving performance when running tests on CI #60 (thanks to @bontscho).
Fix anti-aliasing detection on image edges #51 (@IvanSanchez).
Produce a meaningful error when image data is in the wrong format (thanks to @LearningNerd)
CLI: return non-zero exit code when images differ #54 (@maio).
CLI: make diff output optional.
Make the published NPM module smaller.

Commits

The new version differs by 25 commits.

a53eadd 5.0.0
5ea44fc configurable diff output (colors, alpha) (#61)
89f64b6 update readme
58002be more robust input validation
1531ce2 minor clean up of CLI code
0237f90 upgrade to ES6 syntax; simplify with sync read/write
bd2b562 replace tap with tape
b03a368 make diff optional in cli; clean up
33dc04a Optimize for identical images case (#60)
8a5683b Return non-zero exit code when given images differ (#54)
01af4e0 Fix typo (imagematch -> pixelmatch) (#55)
69efd81 slightly simpler background drawing
7cd740d make matching ~35% faster; style tweaks
f2b6834 update link to antialiasing paper
b1f7744 update travis node version

There are 25 commits in total.

See the full diff

FAQ and help

There is a collection of [frequently asked questions](https://greenkeeper.io/faq.html). If those don’t help, you can always [ask the humans behind Greenkeeper](https://github.com/greenkeeperio/greenkeeper/issues/new).

Your Greenkeeper bot :palm_tree:

Igmat / baset