Update cross-env to the latest version 🚀 (#938)

* chore(package): update cross-env to version 6.0.2

* chore(package): update lockfile package-lock.json

Author: greenkeeper[bot]

package-lock.json

@@ -52,7 +52,7 @@
     "browserify": "16.5.0",
     "codecov": "3.6.1",
     "core-js": "3.2.1",
-    "cross-env": "6.0.0",
+    "cross-env": "6.0.2",
     "eslint": "6.5.1",
     "eslint-plugin-flowtype": "4.3.0",
     "express": "4.17.1",