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-preview[bot] <support@dependabot.com>

package.json

@@ -25,7 +25,7 @@
     "@babel/preset-env": "^7.4.5",
     "auto-changelog": "^2.0.0",
     "chalk": "^2.4.2",
-    "cross-env": "^5.2.0",
+    "cross-env": "^7.0.2",
     "eslint": "^5.16.0",
     "eslint-config-prettier": "^4.3.0",
     "eslint-plugin-prettier": "^3.1.0",