Bump eslint-plugin-prettier from 2.6.0 to 2.7.0 (ember-cli#61)

Bumps [eslint-plugin-prettier](https://github.com/prettier/eslint-plugin-prettier) from 2.6.0 to 2.7.0.
<details>
<summary>Changelog</summary>

*Sourced from [eslint-plugin-prettier's changelog](https://github.com/prettier/eslint-plugin-prettier/blob/master/CHANGELOG.md).*

> ## v2.7.0 (2018-09-26)
> 
> * Update: Support prettierignore and custom processors ([ember-cli#111](https://github-redirect.dependabot.com/prettier/eslint-plugin-prettier/issues/111)) ([38537ba](prettier/eslint-plugin-prettier@38537ba))
> * Build: switch to release script package ([047dc8f](prettier/eslint-plugin-prettier@047dc8f))
> 
> ## v2.6.2 (2018-07-06)
> 
> * Fix: Add representation for \r to showInvisibles ([ember-cli#100](https://github-redirect.dependabot.com/prettier/eslint-plugin-prettier/issues/100)) ([731bbb5](prettier/eslint-plugin-prettier@731bbb5))
> * Docs: Add clarification about Flow/React support to readme ([ember-cli#96](https://github-redirect.dependabot.com/prettier/eslint-plugin-prettier/issues/96)) ([977aa77](prettier/eslint-plugin-prettier@977aa77))
> 
> ## v2.6.1 (2018-06-23)
> 
> * Fix: respect editorconfig ([ember-cli#92](https://github-redirect.dependabot.com/prettier/eslint-plugin-prettier/issues/92)) ([0b04dd3](prettier/eslint-plugin-prettier@0b04dd3))
</details>
<details>
<summary>Commits</summary>

- [`869f56d`](prettier/eslint-plugin-prettier@869f56d) Build: update package.json and changelog for v2.7.0
- [`38537ba`](prettier/eslint-plugin-prettier@38537ba) Update: Support prettierignore and custom processors ([ember-cli#111](https://github-redirect.dependabot.com/prettier/eslint-plugin-prettier/issues/111))
- [`047dc8f`](prettier/eslint-plugin-prettier@047dc8f) Build: switch to release script package
- [`bc33780`](prettier/eslint-plugin-prettier@bc33780) Build: update package.json and changelog for v2.6.2
- [`731bbb5`](prettier/eslint-plugin-prettier@731bbb5) Fix: Add representation for \r to showInvisibles ([ember-cli#100](https://github-redirect.dependabot.com/prettier/eslint-plugin-prettier/issues/100))
- [`977aa77`](prettier/eslint-plugin-prettier@977aa77) Docs: Add clarification about Flow/React support to readme ([ember-cli#96](https://github-redirect.dependabot.com/prettier/eslint-plugin-prettier/issues/96))
- [`1c41c41`](prettier/eslint-plugin-prettier@1c41c41) Build: update package.json and changelog for v2.6.1
- [`0b04dd3`](prettier/eslint-plugin-prettier@0b04dd3) Fix: respect editorconfig ([ember-cli#92](https://github-redirect.dependabot.com/prettier/eslint-plugin-prettier/issues/92))
- See full diff in [compare view](prettier/eslint-plugin-prettier@v2.6.0...v2.7.0)
</details>
<br />

[![Dependabot compatibility score](https://api.dependabot.com/badges/compatibility_score?dependency-name=eslint-plugin-prettier&package-manager=npm_and_yarn&previous-version=2.6.0&new-version=2.7.0)](https://dependabot.com/compatibility-score.html?dependency-name=eslint-plugin-prettier&package-manager=npm_and_yarn&previous-version=2.6.0&new-version=2.7.0)

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`.

---

**Note:** This repo was added to Dependabot recently, so you'll receive a maximum of 5 PRs for your first few update runs. Once an update run creates fewer than 5 PRs we'll remove that limit.

You can always request more updates by clicking `Bump now` in your [Dependabot dashboard](https://app.dependabot.com).

<details>
<summary>Dependabot commands and options</summary>
<br />

You can trigger Dependabot actions by commenting on this PR:
- `@dependabot rebase` will rebase this PR
- `@dependabot recreate` will recreate this PR, overwriting any edits that have been made to it
- `@dependabot merge` will merge this PR after your CI passes on it
- `@dependabot cancel merge` will cancel a previously requested merge
- `@dependabot reopen` will reopen this PR if it is closed
- `@dependabot ignore this [patch|minor|major] version` will close this PR and stop Dependabot creating any more for this minor/major version (unless you reopen the PR or upgrade to it yourself)
- `@dependabot ignore this dependency` will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
- `@dependabot use these labels` will set the current labels as the default for future PRs for this repo and language
- `@dependabot use these reviewers` will set the current reviewers as the default for future PRs for this repo and language
- `@dependabot use these assignees` will set the current assignees as the default for future PRs for this repo and language
- `@dependabot use this milestone` will set the current milestone as the default for future PRs for this repo and language
- `@dependabot badge me` will comment on this PR with code to add a "Dependabot enabled" badge to your readme

Additionally, you can set the following in your Dependabot [dashboard](https://app.dependabot.com):
- Update frequency (including time of day and day of week)
- Automerge options (never/patch/minor, and dev/runtime dependencies)
- Pull request limits (per update run and/or open at any time)
- Out-of-range updates (receive only lockfile updates, if desired)
- Security updates (receive only security updates, if desired)

Finally, you can contact us by mentioning @dependabot.

</details>

yarn.lock

@@ -785,8 +785,8 @@ eslint-plugin-node@^6.0.1:
     semver "^5.4.1"
 
 eslint-plugin-prettier@^2.6.0:
-  version "2.6.0"
-  resolved "https://registry.yarnpkg.com/eslint-plugin-prettier/-/eslint-plugin-prettier-2.6.0.tgz#33e4e228bdb06142d03c560ce04ec23f6c767dd7"
+  version "2.7.0"
+  resolved "https://registry.yarnpkg.com/eslint-plugin-prettier/-/eslint-plugin-prettier-2.7.0.tgz#b4312dcf2c1d965379d7f9d5b5f8aaadc6a45904"
   dependencies:
     fast-diff "^1.1.1"
     jest-docblock "^21.0.0"