Update cross-env to the latest version 🚀 (#4780)

* chore(package): update cross-env to version 5.1.6

* chore(package): update lockfile

https://npm.im/greenkeeper-lockfile

package-lock.json

@@ -2959,9 +2959,9 @@
       }
     },
     "cross-env": {
-      "version": "5.1.5",
-      "resolved": "https://registry.npmjs.org/cross-env/-/cross-env-5.1.5.tgz",
-      "integrity": "sha1-Mdr386Uu8zfI3dpYXwgXXM5dH6U=",
+      "version": "5.1.6",
+      "resolved": "https://registry.npmjs.org/cross-env/-/cross-env-5.1.6.tgz",
+      "integrity": "sha512-VWTDq+G4v383SzgRS7jsAVWqEWF0aKZpDz1GVjhONvPRgHB1LnxP2sXUVFKbykHkPSnfRKS8YdiDevWFwZmQ9g==",
       "dev": true,
       "requires": {
         "cross-spawn": "5.1.0",

package.json

@@ -53,7 +53,7 @@
     "babel-plugin-transform-object-rest-spread": "^6.26.0",
     "babel-preset-env": "1.6.1",
     "bcrypt-nodejs": "0.0.3",
-    "cross-env": "5.1.5",
+    "cross-env": "5.1.6",
     "deep-diff": "1.0.1",
     "eslint": "^4.9.0",
     "eslint-plugin-flowtype": "^2.39.1",