Upgrade: Bump eslint from 5.8.0 to 5.9.0

Bumps [eslint](https://github.com/eslint/eslint) from 5.8.0 to 5.9.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](eslint/eslint@v5.8.0...v5.9.0)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot-support

yarn.lock

@@ -255,8 +255,8 @@ eslint-visitor-keys@^1.0.0:
   resolved "https://registry.yarnpkg.com/eslint-visitor-keys/-/eslint-visitor-keys-1.0.0.tgz#3f3180fb2e291017716acb4c9d6d5b5c34a6a81d"
 
 eslint@^5.6.0:
-  version "5.8.0"
-  resolved "https://registry.yarnpkg.com/eslint/-/eslint-5.8.0.tgz#91fbf24f6e0471e8fdf681a4d9dd1b2c9f28309b"
+  version "5.9.0"
+  resolved "https://registry.yarnpkg.com/eslint/-/eslint-5.9.0.tgz#b234b6d15ef84b5849c6de2af43195a2d59d408e"
   dependencies:
     "@babel/code-frame" "^7.0.0"
     ajv "^6.5.3"