Upgrade prettier and run over all files

[aboyton]

#4012 added prettier support but then didn't run it over everything and turned it on for YAML files despite using a version that doesn't support YAML.

This:

• Upgrades Prettier to 1.14 whic adds yml support.
• Turns on trailing commas = all as that seems to be what most of the code is doing.
• Runs prettier over everything

This also has the bonus of making future PRs much smaller.

PR checklist

• Addresses an existing issue: #0000
• New feature, bugfix, or enhancement
  • Includes tests
• Documentation update

Overview of change:

As above, this upgrades Prettier, sets an option and runs it over everything.

Is there anything you'd like reviewers to focus on?

Not much as this is autogenerated but we should check that it hasn't broken anything.

CHANGELOG.md entry:

• Upgrade Prettier, turn on trailingComma: "all" and run it over all files.

[palantirtech]

Thanks for your interest in palantir/tslint, @aboyton! Before we can accept your pull request, you need to sign our contributor license agreement - just visit https://cla.palantir.com/ and follow the instructions. Once you sign, I'll automatically update this pull request.

[johnwiseheart]

I think its probably a good idea to merge this. @giladgray thoughts?

[JoshuaKGoldberg]

@johnwiseheart this is creating a lot of noise for other PRs. I'll go ahead and merge this in.

[aboyton]

I'm very happy to rebase this if that would help.

[JoshuaKGoldberg]

@aboyton it's ready to be merged except it fails on typescript@next for `object-literal-key-quotes ☹... I can repro locally and am trying to figure it out now. If you can fix it, that'd be great too!

Edit: might be this...

const t = {
  hello: 123,
  bye-bye: 45,
  // ^ invalid syntax
  nested: {
    "bird": 2,
    ~~~~~~     [Unnecessarily quoted property 'bird' found.]
    egg: 3,
  }
};

[JoshuaKGoldberg]

Thanks for this!