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

Closes #41

Author: greenkeeper[bot]

package.json

@@ -3,7 +3,7 @@
   "name": "svelte-redux-shopping-cart",
   "version": "2.14.0",
   "devDependencies": {
-    "cross-env": "^5.2.0",
+    "cross-env": "^6.0.2",
     "css-loader": "3.0.0",
     "cypress": "^3.2.0",
     "http-server": "^0.11.1",