[MIN] remove cross-env from dependencies

package.json

@@ -42,6 +42,7 @@
     "clean-css": "^4.1.11",
     "babel-register": "^6.26.0",
     "coveralls": "^3.0.0",
+    "cross-env": "^5.1.4",
     "cssnano": "^3.10.0",
     "eslint": "^4.18.2",
     "fs": "0.0.1-security",
@@ -65,6 +66,5 @@
     "rollup-watch": "^4.3.1"
   },
   "dependencies": {
-    "cross-env": "^5.1.4"
   }
 }