Bump eslint from 3.19.0 to 4.19.1

Bumps [eslint](https://github.com/eslint/eslint) from 3.19.0 to 4.19.1. - [Release notes](https://github.com/eslint/eslint/releases) - [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md) - [Commits](eslint/eslint@v3.19.0...v4.19.1) Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package.json

@@ -32,7 +32,7 @@
  "connect-history-api-fallback": "^1.3.0",
  "copy-webpack-plugin": "^4.0.1",
  "css-loader": "^0.28.0",
- "eslint": "^3.19.0",
+ "eslint": "^4.19.1",
  "eslint-config-standard": "^6.2.1",
  "eslint-friendly-formatter": "^2.0.7",
  "eslint-loader": "^1.7.1",