Bump cross-env from 5.2.1 to 7.0.2

Bumps [cross-env](https://github.com/kentcdodds/cross-env) from 5.2.1 to 7.0.2.
- [Release notes](https://github.com/kentcdodds/cross-env/releases)
- [Changelog](https://github.com/kentcdodds/cross-env/blob/master/CHANGELOG.md)
- [Commits](https://github.com/kentcdodds/cross-env/compare/v5.2.1...v7.0.2)

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

package.json

@@ -13,7 +13,7 @@
         "@johmun/vue-tags-input": "^2.1.0",
         "axios": "^0.18.1",
         "bootstrap-sass": "^3.3.7",
-        "cross-env": "^5.1",
+        "cross-env": "^7.0",
         "font-awesome": "^4.7.0",
         "jquery": "^3.4.1",
         "laravel-mix": "^5.0",