Bump eslint from 5.13.0 to 5.15.1

Bumps [eslint](https://github.com/eslint/eslint) from 5.13.0 to 5.15.1.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](eslint/eslint@v5.13.0...v5.15.1)

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

package.json

@@ -98,7 +98,7 @@
 		"ava": "^0.25.0",
 		"cross-env": "^5.1.1",
 		"docdash": "^1.0.2",
-		"eslint": "^5.13.0",
+		"eslint": "^5.15.1",
 		"eslint-config-google": "^0.11.0",
 		"eslint-plugin-jsdoc": "^4.0.1",
 		"jsdoc": "^3.5.5",