Update package.json

1. 有个 ssl 的内存泄露问题
manager: fix memory leak with SSL [jpallen]
https://github.com/LearnBoost/socket.io/blob/0.9.14/History.md
2. 有个 xss 的安全问题
This release fixes a XSS bug that affects clients using the Internet Explorer htmlfile transport.
https://github.com/LearnBoost/socket.io/issues/1251

建议还是更新一下socket.io 的库.