Update prettier to the latest version 🚀

[greenkeeper[bot]]

Version 1.12.1 of prettier was just published.

Dependency	prettier
Current Version	1.12.0
Type	devDependency

The version 1.12.1 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.

It might be worth looking into these changes and trying to get this project onto the latest version of prettier.

If you have a solid test suite and good coverage, a passing build is a strong indicator that you can take advantage of these changes directly by merging the proposed change into your project. If the build fails or you don’t have such unconditional trust in your tests, this branch is a great starting point for you to work on the update.

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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).

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Your Greenkeeper bot :palm_tree:

[coveralls]

Coverage remained the same at 75.0% when pulling 553a81a50472be31979f0dc564789634a21b1957 on greenkeeper/prettier-1.12.1 into 74119f479d89ac6cff21a9ddcda69ac408beec0e on master.

[coveralls]

Coverage remained the same at 75.0% when pulling 553a81a50472be31979f0dc564789634a21b1957 on greenkeeper/prettier-1.12.1 into 74119f479d89ac6cff21a9ddcda69ac408beec0e on master.