Update @fortawesome/vue-fontawesome requirement from 0.1.2 to 0.1.5

Updates the requirements on [@fortawesome/vue-fontawesome](https://github.com/FortAwesome/vue-fontawesome) to permit the latest version.
- [Release notes](https://github.com/FortAwesome/vue-fontawesome/releases)
- [Changelog](https://github.com/FortAwesome/vue-fontawesome/blob/master/CHANGELOG.md)
- [Commits](https://github.com/FortAwesome/vue-fontawesome/commits/0.1.5

)

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