Bump vue-router from 3.0.7 to 3.1.2

Bumps [vue-router](https://github.com/vuejs/vue-router) from 3.0.7 to 3.1.2.
- [Release notes](https://github.com/vuejs/vue-router/releases)
- [Changelog](https://github.com/vuejs/vue-router/blob/dev/CHANGELOG.md)
- [Commits](https://github.com/vuejs/vue-router/compare/v3.0.7...v3.1.2

)

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