Support PHP 5.4.0 for version 0.2.0

[ivankristianto]

Hello,

can you please change the guzzlehttp/guzzle package in your composer version 0.2.0?

guzzlehttp/guzzle version 6.* doesn't support PHP 5.4.0. But version 5.* does.
So can you change it to "guzzlehttp/guzzle": "^5.3.1",

and update the tag version to 0.2.1 ?

Thank for your help

[layershifter]

@ivankristianto sorry for delay, makes the sence to me. Feel free to make PR and I will merge it.