Updated cross-env in package.json

package.json

@@ -12,7 +12,7 @@
     "devDependencies": {
         "axios": "^0.17",
         "bootstrap-sass": "^3.3.7",
-        "cross-env": "^5.0.1",
+        "cross-env": "^5.1",
         "jquery": "^3.2",
         "laravel-mix": "^1.0",
         "lodash": "^4.17.4",