Ubuntu启动报错

安装方法：
`npm install -g anyproxy`

错误提示：
```
root@antproxy:~# anyproxy -port 8001
/usr/local/lib/node_modules/anyproxy/node_modules/inquirer/lib/prompts/list.js:32
let index = _.findIndex(this.opt.choices.realChoices, ({ value }) => value === def);
^

SyntaxError: Unexpected token {
at exports.runInThisContext (vm.js:53:16)
at Module._compile (module.js:374:25)
at Object.Module._extensions..js (module.js:417:10)
at Module.load (module.js:344:32)
at Function.Module._load (module.js:301:12)
at Module.require (module.js:354:17)
at require (internal/module.js:12:17)
at Function.promptModule.restoreDefaultPrompts (/usr/local/lib/node_modules/anyproxy/node_modules/inquirer/lib/inquirer.js:5
5:33)
at Object.inquirer.createPromptModule (/usr/local/lib/node_modules/anyproxy/node_modules/inquirer/lib/inquirer.js:65:16)
at Object. (/usr/local/lib/node_modules/anyproxy/node_modules/inquirer/lib/inquirer.js:77:28)
at Module._compile (module.js:410:26)
at Object.Module._extensions..js (module.js:417:10)
at Module.load (module.js:344:32)
at Function.Module._load (module.js:301:12)
at Module.require (module.js:354:17)
at require (internal/module.js:12:17)
```

Start by reproducing `npm install -g anyproxy` and `anyproxy -port 8001` on Ubuntu, then inspect the reported `node_modules/inquirer/lib/prompts/list.js` location and the Node.js runtime version. Done means the command starts without the reported `SyntaxError` in that environment.

Written by the indexing model from the issue text.