Bump fzaninotto/faker from 1.6.0 to 1.8.0

Bumps [fzaninotto/faker](https://github.com/fzaninotto/Faker) from 1.6.0 to 1.8.0.
- [Release notes](https://github.com/fzaninotto/Faker/releases)
- [Changelog](https://github.com/fzaninotto/Faker/blob/master/CHANGELOG.md)
- [Commits](https://github.com/fzaninotto/Faker/compare/v1.6.0...v1.8.0)

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

composer.json

@@ -38,7 +38,7 @@
         "tucker-eric/eloquentfilter": "1.1.*"
     },
     "require-dev": {
-        "fzaninotto/faker": "1.6.*",
+        "fzaninotto/faker": "1.8.*",
         "phpunit/phpunit": "5.7.*"
     },
     "autoload": {