修改node版本依赖

package.json

@@ -6,7 +6,9 @@
     "name": "zhusiqng"
   },
   "private": true,
-  "node": "^12.14.1",
+  "engines": {
+    "node": ">=12.0.0 <13.0.0"
+  },
   "keywords": [
     "node",
     "koa",