add cross-env to dep

package.json

@@ -27,6 +27,7 @@
   },
   "homepage": "https://github.com/wechaty/wechaty-getting-started#readme",
   "dependencies": {
+    "cross-env": "^7.0.2",
     "qrcode-terminal": "^0.12.0",
     "wechaty": "^0.46.2",
     "wechaty-plugin-contrib": "^0.14.2"
@@ -37,7 +38,6 @@
     "@chatie/tsconfig": "^0.10.1",
     "check-node-version": "^4.0.3",
     "connect": "^3.7.0",
-    "cross-env": "^7.0.2",
     "is-pr": "^1.1.0",
     "marked": "^1.1.0",
     "nodemon": "^2.0.3",