set default back to chrome, for there has bug in phantomjs when call Wechaty.getUserName()

package.json

@@ -4,9 +4,9 @@
   "description": "Wechat for Bot (Personal Account)",
   "main": "index.js",
   "wechaty": {
-    "DEFAULT_HEAD": "phantomjs",
+    "DEFAULT_HEAD": "chrome",
     "DEFAULT_PUPPET": "web",
-    "DEFAULT_PROFILE": "default-profile-name",
+    "DEFAULT_PROFILE": "default-profile",
     "DEFAULT_PORT": 8788,
     "DEFAULT_PUPPET_PORT": 18788,
     "DEFAULT_PROTOCOL": "io|0.0.1",

src/config.js

@@ -8,8 +8,8 @@ Object.assign(Config, {
   , endpoint: process.env.WECHATY_ENDPOINT  || Config.ENDPOINT  // wechaty.io api endpoint
   , port:     process.env.WECHATY_PORT      || 0 // 0 for disable port
   
-  , profile:  process.env.WECHATY_PROFILE
-  , token:    process.env.WECHATY_TOKEN
+  , profile:  process.env.WECHATY_PROFILE // DO NOT set to DEFAULT_PROFILE, because sometimes user do not want to save session
+  , token:    process.env.WECHATY_TOKEN   // DO NOT set to DEFAULT, because sometimes user do not want to connect to io cloud service
 })
 
 module.exports = Config.default = Config.Config = Config