Bump eslint and eslint-plugin-vue

Bumps [eslint](https://github.com/eslint/eslint) and [eslint-plugin-vue](https://github.com/vuejs/eslint-plugin-vue). These dependencies needed to be updated together.

Updates `eslint` from 4.19.1 to 5.9.0
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](https://github.com/eslint/eslint/compare/v4.19.1...v5.9.0)

Updates `eslint-plugin-vue` from 4.7.1 to 5.0.0
- [Release notes](https://github.com/vuejs/eslint-plugin-vue/releases)
- [Commits](https://github.com/vuejs/eslint-plugin-vue/compare/v4.7.1...v5.0.0

)

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