build: Bump eslint-config-prettier from 4.1.0 to 6.15.0

Bumps [eslint-config-prettier](https://github.com/prettier/eslint-config-prettier) from 4.1.0 to 6.15.0.
- [Release notes](https://github.com/prettier/eslint-config-prettier/releases)
- [Changelog](https://github.com/prettier/eslint-config-prettier/blob/master/CHANGELOG.md)
- [Commits](prettier/eslint-config-prettier@v4.1.0...v6.15.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

npm-shrinkwrap.json

@@ -47,7 +47,7 @@
     "commitplease": "^3.2.0",
     "eslint": "^5.15.1",
     "coveralls": "^3.0.3",
-    "eslint-config-prettier": "^4.1.0",
+    "eslint-config-prettier": "^6.15.0",
     "eslint-config-standard": "^12.0.0",
     "eslint-config-xo-space": "^0.21.0",
     "eslint-plugin-import": "^2.16.0",

package.json

@@ -1749,9 +1749,9 @@ escodegen@^1.9.1:
   optionalDependencies:
     source-map "~0.6.1"
 
-eslint-config-prettier@^4.1.0:
-  version "4.1.0"
-  resolved "https://registry.yarnpkg.com/eslint-config-prettier/-/eslint-config-prettier-4.1.0.tgz#181364895899fff9fd3605fecb5c4f20e7d5f395"
+eslint-config-prettier@^6.15.0:
+  version "6.15.0"
+  resolved "https://registry.yarnpkg.com/eslint-config-prettier/-/eslint-config-prettier-6.15.0.tgz#7f93f6cb7d45a92f1537a70ecc06366e1ac6fed9"
   dependencies:
     get-stdin "^6.0.0"