update readme add tested node version

binding/nodejs/README.md

@@ -2,11 +2,26 @@
 
 官方维护的 ip2region, 每次数据更新后会更新到 npm 
 
+
 ## Install
+
+**node 版本 : >= 6.0.0**
+
 ```
 npm install node-ip2region --save 
 ```
 
+## 已测试通过的 node 版本列表
+
+```
+6.0.0
+6.11.2
+8.0.0
+10.0.0
+12.0.0
+```
+
+
 ## Example
 
 ```

binding/nodejs/package.json

@@ -1,6 +1,6 @@
 {
   "name": "node-ip2region",
-  "version": "1.0.1",
+  "version": "1.0.2",
   "description": "official nodejs client of ip2region",
   "main": "ip2region.js",
   "scripts": {
@@ -26,5 +26,8 @@
   "devDependencies": {
     "jest": "^19.0.2",
     "benchmark": "^2.1.4"
+  },
+  "engines": {
+    "node" : ">=6.0.0"
   }
 }