update README and package.json

README.md

@@ -17,8 +17,14 @@ general way:
 ```
 npm install && npm start
 ```
-if you want run this inside a docker container
+if you want to run this inside a docker container
 ```
 docker build -t denghongcai/forsaken-mail .
 docker run --name forsaken-mail -d -p 25:25 -p 3000:3000 denghongcai/forsaken-mail
 ```
+Open your browser and type in
+```
+http://localhost:3000
+```
+
+Enjoy!

package.json

@@ -1,12 +1,15 @@
 {
   "name": "forsaken-mail",
-  "version": "0.1.0",
+  "version": "1.0.0",
   "description": "",
   "main": "app.js",
   "scripts": {
     "start": "node ./bin/www",
     "test": "echo \"Error: no test specified\" && exit 1"
   },
+  "engines": {
+    "node": ">=4.0.0"
+  },
   "repository": {
     "type": "git",
     "url": "git+https://github.com/denghongcai/forrsaken-mail.git"