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

Closes #157

Author: greenkeeper[bot]

package.json

@@ -36,7 +36,7 @@
     "@nuxt/common": "^2.3.4",
     "babel-eslint": "^10.0.1",
     "codecov": "^3.0.0",
-    "cross-env": "^5.0.5",
+    "cross-env": "^6.0.2",
     "del-cli": "^1.1.0",
     "eslint": "^5.0.1",
     "eslint-config-i-am-meticulous": "^11.0.0",